I’ve had this backpack for years and used it as a day-hike bag at 28L. However, it’s in really excellent condition! It does come with the fitted water bladder as well. — The Manta Series brings Osprey Hydraulics™ solutions to a multi-sport pack. Using Osprey’s proprietary HydraLock™ system, these packs offer great features for adventure-oriented pursuits. Osprey carry and torso-specific fit help you focus on the adventure and not on what’s on your back. The Manta Series features Osprey’s BioStretch harness with elastic sternum strap and built-in magnet for quick bite valve attachment .The BioStretch hipbelt features zippered side pockets and a modified straight ErgoPull™ closure. Both are made with stretchable materials that allow free body motion with minimal pack bounce. A peripheral LightWire™ frame supports a ventilative mesh backpanel with AirScape™ ridge foam providing further comfort and stability.