Here's what other sites are saying:
Features of the Osprey Kitsuma 1.5 Hydration Pack External reservoir sleeve Blinker light attachment Magnetic sternum strap bite valve attachment Hydraulics LT 1.5L or 2.5L Reservoir included External zippered scratch-free heat-embossed slash pocket Hydraulics LT 1.5L Reservoir included Fabric Details Main: 210D Polyester Honeycomb Bottom: 420HD Packcloth
The lowest of low-profile packs, the Osprey Kitsuma 1. 5L Backpack provides a way to carry your water--and that's about it. Its 1. 5-liter capacity is perfectly filled by the included Osprey Hydraulics LT 1. 5L reservoir to ensure you can hydrate throughout your ride. A magnetic chest strap secures the bite valve for drip free storage, while an Atilon foam framesheet gives the reservoir structure. The AirScape backpanel ensures air can move between you and the pack, and Osprey gave the Kitsuma a BioStretch harness that conforms to your shoulders for a bounce-free ride.