By Heather Burlingame, Senior Production Editor | September 28, 2010

The GB5155 Hi-Vis Low Profile Hydration Pack is made of lime nylon for daytime visibility and reflective glass bead tape for night visibility. Water capacity is 2 liters and lasts about 3 hours under most conditions. Closed-cell insulation keeps the water cool. Padded, adjustable shoulder and chest straps provide comfort.