Veevanpro Internal Frame Hiking Backpack 30L Capacity: 30L; Please search B00MGMF7CG for 40L, Search B00MT7FXVI for 32L, and roll down to the page to the A+ description for more product features and detail Lightweight Nylon material; dimensions: 11.8 x 7.9 x 20.1 inches; Ergonomically designed airflow padded back panel to prevent overheating Adjustable contoured padded shoulder straps and thicken lumbar support for comfort, safety whistle on the sternum strap for emergency Double compression straps on top to secure sleeping pad or other gear, front compression straps to attach trekking pole 2 waist zip pockets, 2 mesh pockets and 2 compartments for storing your necessities, bottom pocket has a rain cover. This backpack can fit hydration reservoir up to 3.0L, but didn't come with reservoir and tubing Design with a airmesh padded back panel for increased ventilation, prevent overheating. Features an internal frame not only to keep a hiker stable on uneven, off-trail terrain, and to transfer the load to the hips. Features with 1 sternum strap, and 1 webbing waistbelt for stabilization and carry comfort. Waist zip pockets for quick access your belongings, from music player to cell phone. Side mesh pockets for store beverage or anything you want. Double adjustable curved padded shoulder straps for ultra comfort while carrying this pack. Bartack stitching in force points of backpack prevents tears and rips and extends its life. Exterior features durable SBS zippers with cord pullers for easy access your essentials. Dual convenient hiking pole attachment points are ideal to free your hands while trekking. 2 compartments are capacious enough to store outdoor gears for overnight or weekend camping or traveling. 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. Bottom zip pocket is designed to stow rain cover, perfect to prevent your backpack from moisture.