I use this pack for everthing bike. Comuting, short rides long rides backcountry, and racing. It has never failed. It holds a full out fit for buisness casuale dress codes plus lunch. On race day or long rides with crazy descents it can cary everything needed. For The tool kit is secure, holds everything wanted or needed and sits low so not to affect balance much at all. It can hold 3 liters so the epic summer rides (like my attempt to ride up the Pikes Peak Barr trail) are feasable. Along with the many small stretchy pockets for snacks. All that is cool but common on mtb packs. What REALLY stamds out for me is that I can carry my rigid leg and arm armor plus a full face helmet on my back (wich allows for full speeds after all the climbing and way more comfortable climbs). I hit the ground at 20+ mph broken wrist but pack was fine. Another truly impressive feature of all Osprey packs is the almighty guaranty wich covered every piece of damage from my dog ate it to stupid clipping to plain worn out (all true stories but it didn't matter). I am a hard rider and my equipment feels it. I dabble in enduro racing and love to just ride hard and often and I need gear that keeps up, this pack makes the cut. After 1 year of ownership I can say for sure. This zealot will not give up his Zealot for anything!