Common materials include polyester fabrics (e.g., polyester canvas and 600D polyester) for outer shells, PEVA liners for waterproofing, ABS hard plastic for rigid bento boxes, and food-grade plastics such as TPE and polypropylene for removable containers and seals.

Many products use leak-resistant or waterproof liners, airtight/lid-sealed containers, and sealed trays to contain spills. Some also include removable or built-in freezer-style ice packs or ice walls that help prevent liquid migration and reduce leakage risk.

Capacity varies by style: small bento trays are around 3.33 cups, some rigid boxes measure about 204 cubic inches, tote-style insulated bags can be as large as roughly 9 quarts, and many soft cooler-style bags are marketed to fit about six to a dozen cans depending on the model.

Products target a broad span: some are marketed for young children (around 3 years and up), others for school-age kids (5+ or 10+), some for adults (18+), and many listings are labeled as suitable for “All Ages.”