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zipper closure
 Lightweight & Comfortable: Weighs only 26 ounces with adjustable shoulder straps, waist straps, and chest straps. The ergonomic design makes your back more comfortable. The soft, breathable mesh pad on the back keeps your back cool and dry.
 Insulated Compartment: This backpack has an insulated layer made of thick aluminum foil material that holds a 2L water bladder for up to 4 hours of liquid cooling. There are two tapes on the top to ensure that the bladder does not bounce during your hiking.