... B50BDescriptionstainless steel vacuum flask/ promotional thermos mug/ travel bottle/ double wall stainless steel travel flask Material304 stainless steel, food ... , SGS, Eco-friendly, BPA free Feature: 1. Material: a. double walls stainless steel 201 b. stainless steel 304 inner and ... convenient to carry.5. Usage: Best choice for household use to hold liquid temperature, especially for water, tea and ...