Product Description1. Healthy Material The foldable travel mug is made of food grade silicone with guaranteed silicone cover, BPA free. Easy to clean, odorless, non-staining, durable, flexible and reusable. 2. Ultra-thin foldable design, portable Updated foldable design, saves space when folded, can be put into pockets, wallets, backpacks, suitcases, does not take up space, ideal for outdoor hiking, camping, travel and sports events.3. Excellent performance Can be hung on the bag - close the lid to keep dust and dirt from getting close. 4. Small foldable volume and light weight make them suitable for both home and outdoor use.