Fresh Express's 1989 breathable bag shipped salad ready to eat and made a category

Companies kicked around bagged salad for foodservice in the late 1970s, but cut lettuce spoiled too fast to package, ship and sell through retail. Salinas, California's Fresh Express cracked the shelf-life problem in 1983, then took it nationwide in 1989 with the patented 'Keep Crisp Bag'.

The bag was a modified-atmosphere package: a semi-permeable film that let the salad's own respiration create a low-oxygen, high-CO2 environment inside, slowing the leaves' aging without chemicals. Fresh Express's own history calls it the first individually packaged, ready-to-eat fresh garden salad marketed to retail stores nationwide.

The category took off on convenience. Today bagged salad ranks third in US retail vegetable sales after tomatoes and potatoes, and Fresh Express says it assembles and ships almost 40 million pounds of salad a month — over 20 million servings a week.

Breathe with the leaves inside the bag

The film turned the product's own breathing into a preservation system

Pre-washed, ready-to-eat salad priced convenience into produce

Nationwide retail distribution was possible only with enough shelf life

The category converted a commodity into a packaged brand

Make the packaging part of the cold chain: control the air the product breathes, not just the temperature around it.

Bagged salad became one of the biggest produce categories in the US, and modified-atmosphere packaging spread across fresh-cut fruit and vegetables. Fresh Express later became part of Chiquita Brands, and the 'breathable bag' approach remains the industry standard.