Comfortable side compression straps and a lightweight design reduces unnecessary weight and bulk on the trail. Equipped with a scratch-free sunglasses pocket and an external light attachment point, the Seral 4 can be used under any conditions.Unisex cycling specific lumbar-pack from Osprey1.5L HydraulicsTM Lumbar Reservoir includedAirScapeTM backpanel with foam ridges for comfort180 degree on/off bite valveFront zipped pocketZipped scratch-free sunglasses/electronics pocket2x zipped hip belt pocketsInternal hydration sleeveInternal organisation pocketInternal mesh side pocketInternal key attachment clipLight attachment pointSide compression strapsReflective graphicsMaximum dimensions: L19 x W32 x D11cmWeight: 0.42kg