This productA special type of bag with thermal insulation properties.，Insulated/Retain heat, product thermal insulation is polyethylene foam+Aluminum foil tin foil, offering excellent heat insulation and preservation; ice packs are packages with a constant temperature effect, designed for cold preservation./Retains heat (provides warmth in winter and coolness in summer), with a thick thermal insulation layer,Offer excellent heat insulation and preservation; the product folds for easy portability. The portable, lightweight, and stylish design keeps food warm and fresh for extended periods, is easy to use, and is suitable for outdoor picnics and everyday life (e.g., for children carrying lunch to school. Enjoy fresh food at any time while ensuring health and hygiene).Custom production to meet customer requirements.