The Welly Traveler Copper Vacuum Bottle 18oz features durable, double-wall stainless steel construction with copper insulation to chill beverages for 48 hours or keep drinks hot for 12 hours. This rugged 18oz bottle includes on-trend powder coating, a screw-on lid, and a natural bamboo wrap, plus a removable, easy-to-clean fruit infuser for adding fun flavors to water.