Why you'll love it The essential Quickstart 2.0 4 Liter Hydration Pack with one main back & one small storage pocket at back designed for the short to moderate road and trail running & hiking. Highlights Maximum Comfort: Moisture wicking stretch woven fabric & chafe free binding materials plus, breathable mesh shoulder straps. Secure Fit: Adjustable sternum straps. Extra Storage To Go: Ample pockets for all the essentials. Features: Unisex; One size fits most; Adjustable sternum straps; Moisture wicking stretch woven fabric with chafe free binding materials; Breathable mesh shoulder straps; 1.5 L Hydration Bladder Included; One main zipper pocket on the back with additional smaller pocket; Bottle pocket on the front for additional hydration; Zippered phone pocket on the front; Reflective hits for 360 degree visibility; Specifications: 60% Nylon, 40% Polyester; Storage Capacity: 244 cu in/4 L; Weight with Bladder: 12.4 oz / 352 g; Weight w/o Bladder: 7.2 oz / 204 g; Wash & Care: To clean pack or vest Hand wash cold; Use mild detergent (try our PowerWash); Line dry; Do not use bleach; Do not use fabric softener; Do not iron or dry clean; To clean bladder Unscrew cap; Separate bladder and hose; Wash bladder with warm water and soap; Run warm soapy water through the hose; Rinse both until soapy residue is gone; Dry with top open; Pro Tip: Use balled up paper towels in your bladder to help it dry; Other Cleaning Tips: Stains: Bladder staining is generally caused by food coloring used in liquids. This staining does not affect the functionality of the bladder, yet can be difficult to remove. We recommend using a chlorine free, non-toxic, and biodegradable tablet to combat stains and odors.; Plastic Taste: Occasionally users may notice a plastic taste. To reduce, squeeze lemon juice into the reservoir, fill with water, and place in the freezer. After frozen, remove, thaw, and rinse.;