Awesome bag. I got it years ago at REI. Used a few times a year, mainly when biking on weekends. 21 liters, has a separate 15 inch laptop holder, secret netting for things like carrying a bike helmet, a secret heavy rain cover that tucks away on the bottom.It also has a hard-shelled sunglass case on the side, water bottle holder on the other side, and great straps. The straps are cool cause they have some wiggle room on the top, so it gives you a customized fit. It's in good but used conditions. Never leaked on me, but in heavy downpours, I'd use the included pack cover! Video here: https://youtu.be/FZ7Cb5AUxEI?feature=shared From original REI listing: Features Waterproof main compartment with roll-top closure keeps contents dry Hideaway high-visibility raincover with reflective screen print for increased bag protection Hideaway helmet attachment system securely holds your helmet when not in use 360° reflective screen print increases visibility from all angles Heat-molded, crushproof SafeZone compartment protects sunglasses, smartphone or other fragile gear Padded, removable 15 in. laptop compartment with tablet sleeve sits on top of bag rather than flat against your back for greater comfort Organization compartment with U-lock stash pocket keeps things organized and secured Airflow channels on EVA back panel and breathable shoulder straps provide maximum comfort and ventilation Blinky light attachment points on back panel and raincover remove the need o