Amazon.com : CamelBak Crux 2L Water Reservoir Bladder with 。This is amazing! Perfect for hiking, camping, running, biking, festivals, climbing, outdoors, This is lightweight pack, has a 1.5-2 liter reservoir bladder, this is NOT included, when you buy used backpacks you always want to get a new water bladder anyway. They are about 12 dollars on Amazon. This is an older one a classic, very nice in great condition, see one light spot on the right corner at the bottom. This has a zipper big pocket on front to hold all of your things you might need to carry with you while being active outdoors. Your phone, keys, compass, many things! Ships right away. Reasonable offers welcome.