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Materials vary by product type: insulated fabric lunch bags are typically polyester; rigid containers and lids commonly use plastics such as ABS or polypropylene (with some TPE parts); some containers list recycled PET (for example, 60% recycled PET). Product listings usually specify the exact material used.

Sizes range from compact storage or pencil boxes (example: about 2.88" H x 7.62" W x 11.5" D) to typical insulated lunch bags (around 8.5" x 4" x 9.5" L x W x H) and larger double-deck or adult lunch bags listing dimensions up to roughly 12.5" x 11" x 10". Individual product listings provide exact dimensions.

Capacity depends on style: small kids' bento trays list volumes like about 2.4–3.25 cups; larger snack bento boxes can be around 2.8 quarts. Some insulated lunch bags are described by can capacity—for example, one listing notes it holds up to 9 soda cans. Check product specs for exact volume or can capacity.

Insulated fabric lunch bags are typically spot- or wipe-clean only. Plastic containers and removable trays are often hand-washable or top-rack dishwasher-safe, and some removable trays are microwave-safe for reheating. Always follow the care instructions on the product listing.

Options span children’s sizes (examples list “Suggested Age: 3–7 Years”) up to items described as suitable for all ages. Check the product description for any recommended age range.

Common features include insulated interiors, leakproof seals or PEVA linings, and upgraded insulation. Some kids’ bento sets also include a removable ice pack to help keep food cool.