The Hydro Flask Tag Along Bottle Sling makes it easy to tote your favorite beverages around town, over the river, and through the Woods. Throw it over your shoulder and bring your Hydro Flask along for the ride. The stretch pocket on the side Features a watertight zipper to keep smaller Items secure while out and about. The small will hang onto bottle sizes 12-24 oz, and the large Fits 32 and 40 oz bottles. Features of the Hydro Flask Tag Along Bottle Sling Fully adjustable, Stretch-woven, Sliplok Shoulder Strap Stretch-woven and bonded side pocket with waterproof zipper for storing essentials Welded webbing and attachment mounts for extra durability Polymax 420D Nylon Upper and 5mm EVA Foam with 400D Nylon Liner