1.vacuum flask 2.double walls with unbreakable structure 3.high vacuum ... and logo can be customized 5.FDA Features1.Material:double walls stainless steel 201/304,according to client's ... products,mainly such as stainless steel vacuum flask, coffee pot, mug, auto mug, sports bottle,etc.Our products ... is available.Expectting for our cooperation!!! stainless steel double-layer vacuum flask/thermos cup