Purchased at REI. I used this once on a hiking trip in the LA area. Adaptable with 2.5 L hydration pack. Bag not included but willing to sell as add on for an extra $15. Either way, it’s a great day hiking back pack or for trail running. Nice because it fits snug and doesn’t bounce around. Comfortable running belt with breathable straps. Hip pockets are my favorite. Versatile fit, comfortable wear for me 5’4” 125lbs and husband 6’ 175lbs. Can meet in Turlock, Modesto, Riverbank and occasionally Manteca Below are the features: QuickConnect and sternum strap magnet for bite valve Front panel zippered main compartment and separate zippered internal reservoir sleeve Front panel zippered slash pocket Accessible dual lower side panel zippered stretch mesh pocket Lower stabilizing/expansion compression straps Snap-in adjustable/removable dual chest straps for customized stability Vertical zippered harness slash pocket for valuables or phone Dual extra-large stretch mesh soft flask/food harness pockets Dual lower stretch mesh food/supplement harness pockets Trekking pole attachment Tuckaway safety whistle Front panel stretch mesh compression pocket Hipbelt stabilizing wrap with zippered pockets