capCAP is the civilized 2-in-1 accessory cap for Nalgene & other popular wide-mouth drink bottles. Most wide-mouth bottles are easy to fill and clean, but the standard opening is too big to drink from easily without spilling. Narrow-mouth bottles are great to drink from but you can forget about putting ice cubes in them, let alone clean them. And bottle inserts don"t really fix a spout that was never meant for daily drinking. capCAP offers the best of both worlds.