QUICK ANSWER: When was the retort pouch invented, and why did commercialization take so long? |
The retort pouch was jointly developed by the US Army Natick R&D Command, Reynolds Metals, and Continental Flexible Packaging — research began in the early 1950s, the award was granted in 1978. |
Japan's Otsuka Foods launched the world's first commercial retort product (Bon Curry) in February 1968 — 13 years before the US Army's own MRE program. |
Three barriers delayed Western commercialization: laminate costs vs. tin cans, immature fill-seal equipment, and consumer resistance to flexible shelf-stable packaging. |
The US consumer market finally cracked open in 1999 (pet food) and 2000 (tuna) — more than 30 years after Japan. |
Today the global retort pouch market is approximately $5.7 billion (2025) and growing at 6–7% annually, led by Asia-Pacific with ~41% market share. |
Table of Contents
• 1. The Wartime Problem That Started Everything
• 2. Three Organizations, One Invention
• 3. Why Commercialization Took 30 Years: The Triple Barrier
• 4. Japan Cracks the Commercial Code First
• 5. The Slow Road to US Consumer Adoption
• 6. The Complete Invention Timeline (Table)
• 7. The Market Today: Six Decades Later
• 8. What This History Means for Today's Packaging Buyers
• 9. Frequently Asked Questions
1. The Wartime Problem That Started Everything
It is the early 1950s. The US Army's Quartermaster Food and Container Institute in Natick, Massachusetts — the division responsible for feeding soldiers in the field — faces a persistent logistical problem. Metal cans work, but they are heavy, bulky, and slow to heat. A 24-can case of C-rations weighs over 20 kg. Every kilogram of packaging is a kilogram a soldier must carry.
The question on the table: could food be sterilized in a lightweight, flexible container that takes up no more space than the food itself?
This question, and the decades-long technical effort to answer it, produced one of the most commercially significant packaging innovations of the 20th century. The earliest recorded scientific studies on thermally processed food in flexible packaging date to 1955, when researchers Hu, Nelson, and colleagues at the University of Illinois published the first systematic findings on the topic. The Army's Natick Command, seeing the operational potential, began funding contractor research alongside its own laboratory work.
Pro Tip: The retort pouch was never primarily a food technology innovation — it was a military logistics optimization. The packaging engineers who built it were trying to reduce the weight of a soldier's pack, not improve the dining experience. This origin shaped every design choice: shelf stability without refrigeration, minimum weight per calorie, maximum durability under field conditions. |
2. Three Organizations, One Invention
By 1958, the research had moved from theory to material development. Continental Flexible Packaging, based in Chicago, began systematic work on retort-compatible laminate structures. In 1959, in collaboration with Ohio State University, Continental tested sample pouches under simulated retort conditions. Three years later, in 1962, Natick placed its first commercial procurement order: 40,000 pouches made with Continental's laminate material.
Reynolds Metals Company was developing retort pouch materials through a parallel track, beginning in the mid-1950s. In 1968, Reynolds successfully used roll-stock pouch material for commercial vegetable packaging in consumer test markets in New York and Florida.
In 1978, the Institute of Food Technologists formally recognized the invention by awarding the IFT Food Technology Industrial Achievement Award jointly to:
• US Army Natick R&D Command (institutional backer, first procurement, process requirements)
• Reynolds Metals Company (materials development, consumer market trials)
• Continental Flexible Packaging (materials development, first commercial laminate, international licensing)
No single organization invented the retort pouch. It was an industrial collaboration across military, materials science, and packaging engineering disciplines — a development pattern common to transformative packaging technologies.
3. Why Commercialization Took 30 Years: The Triple Barrier
The technical feasibility of retort pouches was demonstrated in the early 1960s. Continental licensed its technology to manufacturers in Denmark and England in 1967, and Japan in 1968. Yet mainstream commercial adoption in the US did not arrive until the late 1990s. Three structural barriers created this 30-year gap.
Table 1: Three Barriers to Retort Pouch Commercialization (1960s–1990s)
Barrier | The Problem (1960s–1970s) | What Resolved It |
Cost of Materials | Early laminate structures (PET/Al/CPP) required expensive foil and precision adhesive bonding. Per-unit cost was 3–5x that of a tin can at equivalent volume. | Scale: as global demand grew through Japan and military use, material costs dropped dramatically. By the 1990s, parity with cans was achievable at sufficient volume. |
Filling Equipment Maturity | Conventional FFS (Form-Fill-Seal) machines were designed for rigid containers. Adapting them to flexible pouches required new overpressure retort controls and precise seal geometry validation. | Japanese and European equipment manufacturers (notably Toyo Seikan group) invested heavily in dedicated retort FFS lines through the 1970s–80s, making equipment commercially available. |
Consumer Acceptance | In Western markets, shelf-stable food 'in a bag' was unfamiliar. Consumers associated pouches with low-quality products. Supermarkets were skeptical of shelving a new package format. | Pet food led the way in the US. Consumers accepted pouches for pets before accepting them for themselves. Tuna and baby food followed, slowly normalizing the format. |
Source: Lampi (1977), Al-Baali & Farid (2006), IFT Food Technology (2003); Sunkey analysis.
The third barrier — consumer acceptance — proved to be the most persistent. In Japan, a culture comfortable with novel food formats and a specific culinary application (ready-to-eat curry, a beloved everyday meal) provided the ideal conditions for early adoption. In the US and Europe, no equivalent catalyst existed until pet food provided an indirect route to consumer familiarity.
4. Japan Cracks the Commercial Code First
In the early 1960s, Akihiko Otsuka, head of Otsuka Pharmaceutical Factory in Japan, read an article in Modern Packaging, a US trade publication, describing vacuum-sealed sausages developed for military field rations. He recognized that the sterilization technology his company had developed for intravenous fluid production could be applied to food.
The product concept was straightforward: a single-serving of Japanese curry that could be prepared by anyone, anywhere, in three minutes by submerging the pouch in hot water. After roughly four years of development — solving heat penetration problems, adjusting ingredient cutting techniques, calibrating pressure and temperature profiles — Otsuka Foods launched Bon Curry in February 1968.
The product was initially limited to test markets in Japan's Hanshin region due to a shelf life of only two to three months. The following year, 1969, an improved three-layer pouch construction (polyethylene/aluminum/polyester) extended the shelf life to two years, enabling national distribution. By coincidence, Apollo 11 launched that same year — vacuum-packed space food attracted significant media attention and provided unexpected consumer education about shelf-stable flexible packaging.
By 1973, Bon Curry was selling 100 million packs per year in Japan alone. Bon Curry has since sold more than three billion units total and holds a Guinness World Records certification as the world's longest-selling retort-pouch curry brand.
Pro Tip: Toyo Seikan Group, Japan's leading packaging manufacturer, played a critical enabling role in Japan's retort pouch adoption. While Otsuka Foods drove the consumer product, Toyo Seikan invested in and commercialized the retort pouch laminate manufacturing and filling equipment infrastructure that made scaling up possible across the Japanese food industry. |
Table 2: US vs Japan — A Tale of Two Adoption Timelines
Dimension | Japan | United States |
First commercial launch | February 1968 (Bon Curry, Otsuka Foods) | May 1999 (Whiskas cat food, Mars/Kal-Kan) |
Initial application | Consumer curry — convenience meal for households | Pet food — consumer skepticism bypassed |
Mainstream food adoption | ~1973 (Bon Curry 100M packs/year) | ~2001–2003 (tuna, salmon pouches at retail) |
Driving factor | Cultural openness to new formats; Otsuka's pharma-grade sterilization expertise | Pet food proved safety and shelf life; military MRE credibility helped |
Regulator posture | MHLW approved early; domestic equipment investment followed quickly | FDA required formal process authority validation (21 CFR Part 113); approval process slowed new entrants |
Market position today | Japan is the world's most sophisticated retort pouch consumer market; 500+ varieties widely available | Rapidly growing — pet food, tuna, ready meals, baby food all mainstream |
Source: Otsuka Foods corporate history; Wikipedia/IFT historical records; Sunkey analysis.
5. The Slow Road to US Consumer Adoption
While Japan built its retort pouch market through the 1970s and 1980s, the US market remained almost exclusively military. The Army's MRE (Meal, Ready-to-Eat) program, launched in 1981, became the world's largest single-application deployment of retort pouches. But civilian adoption was blocked by the same triple barrier.
The consumer breakthrough came from an unexpected direction: pet food. In May 1999, Mars Inc. (operating under its Masterfoods / Kal-Kan brand) launched Whiskas cat food in a retort pouch in the US market. Pet food consumers were less resistant to unfamiliar packaging formats, and the product performed well. It demonstrated to the broader food industry that US consumers could accept retort flexible packaging.
On June 15, 2000, StarKist — then owned by H.J. Heinz — announced the launch of StarKist tuna in a retort pouch. This was a watershed moment for the format: tuna was a mainstream, high-volume, price-sensitive category. If a retort pouch could compete with a tin can in canned tuna, it could compete anywhere.
Baby food, ready meals, and seafood followed through the 2000s. The retort pouch had arrived in the US market — approximately 32 years after Bon Curry.
6. The Complete Invention and Commercialization Timeline
Table 3: Retort Pouch History — Key Milestones from 1940 to Today
Period | Milestone | Key Actor(s) |
Early 1940s | Concept of heat-sterilized flexible food packages first proposed | Anonymous US industry researchers |
1955–1956 | First recorded laboratory studies on flexible packaging for thermally processed foods | University of Illinois (Hu et al.; Nelson et al.) |
1950s | US Army Quartermaster Food & Container Institute begins funded R&D into flexible combat rations | US Army Natick (Quartermaster Division) |
1958 | Continental Flexible Packaging begins systematic material development; Ohio State University testing in 1959 | Continental Flexible Packaging, Ohio State Univ. |
1962 | First military procurement: Natick orders 40,000 pouches using Continental's laminate | US Army Natick R&D Command |
1967–1968 | Continental licenses pouch technology to companies in Denmark, England, and Japan | Continental Flexible Packaging (licensees) |
Feb 1968 | World's FIRST commercial retort food product: Otsuka Foods launches Bon Curry in Japan | Otsuka Foods Co., Ltd. (Japan) |
1968–1969 | Retort pouch food used on Apollo missions; Japan expands to nationwide Bon Curry distribution | NASA; Otsuka Foods |
1973 | Bon Curry reaches 100 million packs/year in Japan — proof of mass-market commercial viability | Otsuka Foods (Japan market) |
1978 | IFT Food Technology Industrial Achievement Award: retort pouch formally recognized as a major invention | US Army Natick + Reynolds Metals + Continental Flexible Packaging |
1981 | US Army deploys MRE (Meal, Ready-to-Eat) — retort pouches enter large-scale military logistics | US Department of Defense |
1999 | US consumer breakthrough: Mars/Kal-Kan launches Whiskas cat food in retort pouch (May 1999) | Mars Inc. (Masterfoods / Kal-Kan) |
2000 | StarKist announces retort tuna pouch (June 15, 2000) — mainstream US consumer adoption begins | StarKist (H.J. Heinz) |
2025 | Global retort pouch market: ~$5.7 billion/year, growing at 6–7% CAGR; Asia-Pacific leads with 41% share | Global market (Amcor, Mondi, Sealed Air, regional converters) |
Sources: Lampi (1977); Al-Baali & Farid (2006); Otsuka Foods corporate records; Wikipedia retort pouch article; Mordor Intelligence (2025); Sunkey research.
7. The Market Today: Six Decades of Compound Growth
The retort pouch market has compounded from virtually zero commercial revenue in 1968 to approximately $5.7 billion globally in 2025. Industry research forecasts the market to reach $8–10 billion by 2030–2034 at a compound annual growth rate of 6–7%.
Table 4: Global Retort Pouch Market Size — Historical and Forecast
Year | Global Market Size | CAGR (period) | Asia-Pacific Share |
2022 | ~$4.9 billion | — | ~38% |
2024 | ~$5.4–5.6 billion | ~6% (2022–2024) | ~40% |
2025 (est.) | ~$5.7 billion | ~6–7% p.a. | ~41% |
2030 (forecast) | ~$7.7–8.3 billion | ~6–7% CAGR | Leading region |
2034–2035 (forecast) | ~$10–11 billion | ~6–7% CAGR | ~40–42% |
Sources: Mordor Intelligence (2025); Global Growth Insights (2025); GMI (2025); multiple research firms. Note: market definitions and scope vary between research providers; figures represent consensus range.
Asia-Pacific dominates global volume, accounting for approximately 41% of market revenue in 2025. Japan, China, and India are the three largest country-level markets. Japan's position is paradoxical: it was the first market to achieve mass consumer adoption (1968–1973) and remains the most sophisticated in terms of product variety (500+ SKUs), yet it is now a mature market growing modestly. China and India are driving volume expansion. Middle East and Africa show the fastest growth rates globally (approximately 7% CAGR) due to dependence on imported shelf-stable food and strategic government stockpiling programs.
Stand-up pouches account for approximately 59% of the retort pouch market by revenue, reflecting the ongoing displacement of flat pouches in premium retail segments. Pet food and ready-to-eat human food remain the two largest end-user categories.
8. What This History Means for Today's Packaging Buyers
The history of the retort pouch contains a practical lesson that is still directly relevant to manufacturers considering a transition from rigid to flexible packaging. The same barriers that delayed commercialization in the 1960s–1990s resurface in individual company adoption decisions today.
• Cost barrier: Unit price comparisons between pouches and cans are misleading without accounting for total cost of ownership. Logistics savings (weight, cube utilization, return freight) frequently offset a higher per-unit laminate cost at sufficient volume. Our retort pouch TCO analysis walks through the full calculation.
• Equipment barrier: Form-Fill-Seal line conversion for retort flexible packaging requires capital investment and process validation. The validation timeline (typically 14–22 weeks for a new scheduled process) is not compressible — it mirrors the technical challenge that delayed commercialization in the 1960s. Our process validation guide covers the F-value and heat penetration study requirements in detail.
• Market acceptance: For new market entrants, the Japan experience suggests that finding the right consumer entry point matters more than the technology. Pet food unlocked the US market. Convenience meals are unlocking emerging markets. Identify the product category in your portfolio where the consumer benefit of the pouch — convenience, portability, portion control — is most compelling.
Pro Tip: The IFT recognized the retort pouch's inventors 16 years after the first military procurement and 10 years after Japan's commercial launch. Industry recognition lagged actual technical achievement by a decade. This pattern continues today — sustainable mono-material retort structures are technically feasible now but will take a similar lag to achieve mainstream commercial adoption. Companies that move early on the current format transition will likely hold the same advantage that Otsuka Foods held in Japan in 1968. |
9. Frequently Asked Questions
Q1: Who invented the retort pouch?
The retort pouch was jointly developed by three organizations: the US Army Natick R&D Command, Reynolds Metals Company, and Continental Flexible Packaging. They received the IFT Food Technology Industrial Achievement Award in 1978 for the invention. Research roots go back to the early 1950s, with material development accelerating in 1958.
Q2: When was the first commercial retort food product launched?
The world's first commercial retort food product was Bon Curry, launched in February 1968 by Otsuka Foods in Japan. Inspired by a US Army field ration article, Otsuka adapted its pharmaceutical sterilization technology to produce a shelf-stable curry in a flexible laminate pouch. Annual sales reached 100 million packs within five years.
Q3: Why did it take so long for retort pouches to reach US consumers?
Three barriers delayed US consumer adoption: high per-unit laminate costs compared to tin cans, the immaturity of fill-seal equipment designed for flexible pouches, and consumer skepticism about shelf-stable food in flexible packaging. The US market was finally unlocked by pet food (1999), followed by tuna (2000) and baby food — formats where consumers focused on convenience rather than package format.
Q4: What is the role of the US Army in retort pouch history?
The US Army's Natick Quartermaster Food and Container Institute was the earliest institutional backer of retort pouch R&D, beginning in the early 1950s. Natick placed the first commercial procurement order (40,000 pouches) in 1962 and used retort pouches in the Apollo space program from 1969. The Army's MRE (Meal, Ready-to-Eat) program, launched in 1981, became the world's largest single application of retort pouches.
Q5: What is the retort pouch market size today?
The global retort pouch market was estimated at approximately $5.5–5.7 billion in 2025, growing at a CAGR of 6–7%. Asia-Pacific leads with approximately 41% of global market share, driven by Japan, China, and India. The market is forecast to reach $8–10 billion by 2030–2034. Stand-up pouches account for approximately 59% of the market by volume.
Q6: What is Bon Curry and why does it matter to the history of packaging?
Bon Curry is a Japanese ready-to-eat curry in a retort pouch, launched by Otsuka Foods in February 1968. It is recognized by Guinness World Records as the world's longest-selling retort-pouch curry brand. Its commercial success — reaching 100 million packs per year by 1973 — proved that retort flexible packaging could achieve mass-market adoption, paving the way for all subsequent global commercialization.
Q7: How does a retort pouch differ from a tin can?
Both tin cans and retort pouches achieve shelf stability through heat sterilization at 116–121°C, but the pouch is a flexible laminate (typically PET/Al/CPP or PA/Al/CPP) that offers significant logistics advantages: 75% weight reduction, faster heat penetration during retort processing, and flat storage when empty. For a detailed comparison of the two formats including cost-per-unit and shelf-life data, see our complete retort pouch vs metal can analysis.
Q8: What are the standard laminate structures used in retort pouches?
The most common three-layer structure for retort pouches is PET (12 µm) / aluminum foil (9 µm) / CPP (70–80 µm). PET provides puncture resistance and printability, aluminum foil delivers complete barrier against oxygen, moisture, and light, and CPP acts as the heat-seal and food-contact layer. For applications requiring transparency, BOPA/CPP or PET/BOPA/CPP structures are used, though at higher oxygen transmission rates.
Ready to Source Retort Pouches That Carry 70 Years of Proven Technology? Sunkey Packaging manufactures retort pouches certified to BRC, FDA, and EU 10/2011 standards — building on the same laminate science that has preserved food since the 1960s. Email: info@sunkeycn.com | WhatsApp: +86-138-1251-1247 www.sunkeycn.com | Говорим по-русски! |
Related Articles in This Series
• Blog 1: Retort Pouches: The Complete Guide to Heat-Resistant Flexible Packaging — sunkeycn.com/retort-pouch-complete-guide
• Blog 2: Retort Pouch vs Metal Can: A Data-Driven Comparison for Food Manufacturers — sunkeycn.com/retort-pouch-vs-metal-can
• Blog 4: F-Value and Heat Penetration Studies: The Complete Process Validation Guide — sunkeycn.com/retort-pouch-f-value-process-validation
• Blog 18: How One Japanese Company Has Controlled the World's Oxygen Barrier for 50 Years — sunkeycn.com/kuraray-evoh-monopoly-barrier-materials
• Blog 19: Chemical Recycling of Flexible Packaging: Industry Revolution or Expensive False Promise? — sunkeycn.com/chemical-recycling-flexible-packaging-reality-check
© 2026 Sunkey Packaging Co., Ltd. All rights reserved. | www.sunkeycn.com
Disclaimer: Historical data in this article is compiled from publicly available industry records including US Army Natick Command publications, Otsuka Foods corporate history, IFT archives, and academic literature (Lampi 1977; Al-Baali & Farid 2006). Market sizing data sourced from multiple third-party research providers; figures represent a range across sources. This article is for informational purposes only and does not constitute technical specifications for procurement decisions.
Blog 17 of 20 | Sunkey Retort Pouch Content Series | Phase 4: Outer Layer | Published 2026
