I've owned this pack for over a year, used in every condition from freezing cold to 100deg summer heat to pouring rain. Here's a quick list of reasons to buy this pack:
-3L capacity means you won't run low as often
-lighter weight than similar products
-roomier than it looks, great organization. I can carry tools, tire pump AND shock pump, tubes, wallet/phone and still have plenty of room for food...and everything is EASY to access without partial unloading
-the magnetic tube holder is awesome!
-no sloshing, and the rigid bladder support improves airflow on my back
-stuff inside stays dry even after a four hour (very) rainy ride
-Compliments! Your friends will want one too