*Leakproof: The inner splicing area of the lunch bag adopted voltage fusion technics which feature an excellent leak-proof seal. And its PVC lining fits the main compartment perfectly to keeps liquids inside without making your bag wet and dirty.**Reinforced Heat & Cold Preservation: The interior lining of the cooler bag is made of food-grade EVA material, and the middle layer is made of 8mm thick pearl cotton. Multi-layer combination will keep food fresh and warm/cold. [Please note: The straps are stored in a compartment on the front of the ice pack.]