The Hydro Sleeve is the perfect solution for carrying water bladders inside your Stone Glacier pack. It is large enough for any 3-liter bladder system. The Hydro Sleeve mounts on the sewn in 3/4" black trislides on the inside back-panel of all Stone Glacier bags (excluding Terminus packs). The hydration hose can be run through the right or left side of the Hydration Port at the top of all Stone Glacier packs. Hydro Sleeves also work great for packing food, clothing, or other loose gear. Specifications Weight - 1.7 oz. Compatible with all Stone Glacier Bags Not Compatible with Terminus Packs Dimensions: 16" x 8" x 3" (Height x Width x Depth) Heavy duty YKK #8 zipper Ripstop Nylon Made in the USA Expert Insights If you're the type of guy or gal who prefers to use a hydration bladder rather than a Nalgene bottle, and you have a Stone Glacier backpack, then the Hydro Sleeve is an absolute necessity. It is everything you need and nothing that you don't. Product Videos