Zojirushi's Flip-and-Go Stainless Mug is designed with a Flip-and-go handle for convenient carry and folds down for a comfortable hold. The bottle is lightweight and compact for added portability. The one-touch, flip-open lid is easy to operate with one hand, even when wearing gloves. The 2-step lid release process prevents excess condensation on the stopper from being flung off while the lid opens and locks back. The air vent allows beverages to flow out smoothly without gushing or overflowing. Lid also features an easy-to-operate slide lock to keep the lid from opening accidentally. Wide mouth opening (1-5/8") accommodates full-size ice cubes and is easy to fill. Made of BPA-free plastic and stainless steel and a 5 year on heat retention.