American Kargo 3519-0023 Hi-Viz Turbo 3.0 Hydration Pack PVC backed, micro-weave 600-denier construction with double-needle seams Four-way adjustable butterfly harness ensures security and a proper fit Retroflect material provides additional visibility in less than optimal riding conditions Includes thermal-lined bladder compartment and support panel with a fleece-lined interior for maximum protection Easy overhead removal when releasing lower buckles