It has a proper air flow back - not just raised padding.
It has roomy side pockets to hold drink bottles.
There are pockets everywhere - even on the waist band/strap.
It is quite light, and really easy to access.
It stands upright when put on the floor.
It is really comfortable to use, both by me, 5'8" and him 6'9"
And - it is soooo affordable.