Ease of squeeze, lasting insulation, and featuring HydraPak's high-flow Surge cap. This lean, clean bottle is a go-to for cycling or anyone who loves to move fast. The Surge cap’s design delivers a steady stream then automatically seals for drip-free transport, and our Tri-Layer insulation holds the chill for hours. Its slim, ergonomic design is comfortable in your hand, and slides right into your bike’s cage.