EcoVesselsel 2-Piece Screw Cap - Silver with Lime Green Strap DRINKING MADE EASY -The wide opening is for easy filling, and the small opening for easy drinking. Add your favorite fruits or ice to add natural flavoring to your water CREATES A TIGHT SEAL - EcoVessel Replacement Stainless Steel Dual Top fits with the newer Boulder, BigFoot, Growler and Twist bottles; the top measures 2 inches tall and 2.75 inches in diameter; this part comes as one piece and is sold as a unit VARIETY AND STYLE - The EcoVessel Replacement Stainless Steel Dual Top comes in different colors to choose from; mix and match according to your taste and your favorite EcoVessel bottle LEAK PROOF AND EASY TO CARRY - Simply toss your bottle in a bag and go! The dual top creates a tight seal to avoid leaks and makes carrying the bottle around easier with an integrated carrying strap