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1. Food-grade silica gel, BPA FREE, can pass FDA and LFGB tests 2. It is comfortable to hold, non-slip and not hurt hands. 3. It can be folded at will, saving space: it is very suitable for traveling and camping. Temperature resistance up to 100 degrees, can be filled with hot water, cold watercontact supplier or email to admin@b2bgood.com for transport and cleanrance agent