Made for everyday travel, this Planetary Design Adventure Tumbler in Storm Grey is awesome. It features a spill-proof, snap-lock lid that’s easy to drink from. The cup’s body is double-walled and vacuum insulated. It keeps hot drinks HOT (or cool things cool) for hours. The ergonomic design fits comfortably in both your cup-holder and your hand. The durable and textured coating prevents slipping or dropping. There’s no extra parts on the lid, so it’s easy to clean. The Planetary Design Adventure Tumbler in Storm Grey is not 100% drip-proof… So don’t lay it down in your gym bag! However, it will take a rough ride down a bike path, no problem!