Insulated thermo lunch bag

Insulation Layers

A middle insulating material (e.g. foam, thermal batting, EPE foam) to slow down heat transfer. 

Reflective inner lining (e.g. aluminum foil) to reflect radiant heat, helping keep things hot or cold. 

Outer Material

Durable, water‑resistant or waterproof fabric like polyester, nylon, oxford cloth, etc. for use outdoors and to resist spills. 

Reinforced bottom or base so the bag keeps shape and doesn’t sag. 

Inner Lining

Waterproof or easy‑to‑wipe material (PEVA, PVC, aluminum lining) so leaks and condensation are easy to clean. 

Secure Closure

Good zippers or Velcro closures to seal in temperature and avoid air exchange. 

Compartments / Organization

Main compartment for the meal

Additional pockets (side for bottles, front for utensils, mesh for snacks) to organize items. 

Capacity & Size

Big enough to fit your food containers plus maybe some extras (snacks, ice packs).

Compact enough to carry comfortably. 

Portability

Handles, possibly a shoulder strap, so it’s easy to carry. 

Lightweight when empty. 

Leak‑proof / Spill Protection

Sealed or heat‑welded seams, waterproof lining, sometimes double layer at the base. 

Easy to Clean

Materials that are wipeable

Insulated thermo lunch bag