The whole bag can be compressed with the InsideOut straps, and any hydration reservoirs can be refilled with an external hydration sleeve and reservoir hanging loop. With numerous other features, attachments and considerations, the Talon 55 is a truly versatile hiking rucksack, one that you can depend on for years of service on your adventures.FeaturesAdjustable torso lengthAirScape mesh covered accordion foam backpanelLidLock bike helmet attachmentExternal hydration accessFlap access with clip closureInternal key attachment clipInternal top load compression strapLED light attachment pointSeamless lumbar to hipbelt body wrapSternum strap with emergency whistleStow-on-the-Go trekking pole attachmentStretch front pocketStretch mesh side pockets with InsideOut compressionStretch pocket on harnessTop lid accessTwin ice axe loopsTwin zippered hip belt pocketsFabric: 100D x 210D Bluesign Recycled Robic NylonMaximum Dimensions: L74 x W33 x D26cmWeight: 1.6kg (M/L)