Veevanpro Internal Frame Hiking Backpack 40L Capacity: 40L; Please search B00MT7FY08 for 30L, Search B00MT7FXVI for 32L, and roll down to the page to the A+ description for more product features and detail Lightweight water-resistant and nylon material; dimensions: 13.3 x 22.6 x 7.8 inches; Ergonomically designed airflow padded back panel to prevent overheating Adjustable contoured padded shoulder straps and thicken lumbar support for comfort Adjustable sternum strap, waist belt and internal frame enhances the stability 2 front zip pockets, 2 side zip pockets and 2 compartments with multiple interior pockets for organization; This backpack can fit hydration reservoir up to 3.0L, but didn't come with reservoir and tubing Features an internal frame not only to keep a hiker stable on uneven, off-trail terrain, and to transfer the load to the hips. Bartack stitching in force points of backpack prevents tears and rips and extends its life. Features functional interior and exterior pockets to organize your necessities, from cell phones to map. Main compartment is capacious enough to store outdoor gears for overnight or weekend camping or traveling. Design with double adjustable curved padded shoulder straps and a airmesh padded back panel for increased ventilation, prevent overheating, it is ideal to dampen the shock of weight transfer while transporting your gear. Features with 1 sternum strap, and 1 webbing waistbelt for stabilization and carry comfort. Dual convenient hiking pole attachment points are ideal to free your hands. Interior bladder pocket in main compartment is available for a 3.0 L hydration bladder, top with a handy hose exit and a fastening loop on the strap.