One-Touch Flip Lid.The Ello Colby 40-ounce vacuum insulated stainless steel water bottle is built to last. Vacuum insulated stainless steel keeps beverages cold for hours. Colby's leak-proof locking flip lid features a fully-covered and yuck-free straw that minimizes spills. A silicone boot acts as a built-in coaster and protects the bottle from dings and dents. Hydrate safely with a Guardian® Technology antimicrobial straw, which reduces stains and odor. Antimicrobial properties are built into the silicone straw to protect the straw alone, not the user. Take it on-the-go with a built-in soft touch carry loop.