The Vertical 4L is a comfortable but capable multi-sport hydration pack specifically developed for any adventure. It's one of the best fitting packs they offer and comes in the sweet spot of 4L of total storage, including a 2.0L hydration bladder. That means you can carry spare gear, snacks, and any essentials without stuffing pockets or being weighed down.If you're unsure where to start, this pack may be the answer. This one is simple and effective.NDM harness technology for a bounce-free fit2.0L bladder includedWater resistant Phone Pocket at the back. Inner size: 8 - 16 cmItem SpecificationsBack ProtectionNoColorCarbon BlackDefined ColorBlackGender/AgeUnisexReservoir IncludedYesReservoir Volume (fl oz)2.0Total Volume2Weight300 USWE Verticle 4L Hydration Packs UPC: 7350069254306