Our Take

 A low-profile, minimalist way to wear your water and bring along essentials on your journey, the Nathan QuickStart 2.0 4 L hydration pack includes a 1.5-liter hydration bladder with hose and valve.

 Features:

• Included 1.5-liter BPA-free reservoir with hose and valve stows easily in the back panel
• Rear-focused water storage design offers comfort and ease
• Lightweight, soft, stretchy fabric wicks away moisture and has a soft perimeter binding that prevents chafing for overall comfort
• 2 front stash pockets, including a zippered phone pocket, balance the load and provide quick access to nutrition and essentials
• Front pocket fits bottles and flasks up to 22 fl. oz. (not included)
• 1 main compartment and 1 small storage pocket at back hold extra layers and other running essentials
• One size; adjustable front and side straps let you dial in the fit