I actually got my aus post hydration pack for last years fathers day. so 12 months, old plenty of rides and no problems yet.they have heaps of pockets and even a mesh storage area which I use to store my spare tube in, I personally am happy with the performance of them, I`m sure the dearer brands offer more bladder space and storage but 2 litres of water lasts as long as a tank of fuel does for me so if i need to pack fuel for a ride I also pack water and fill both the bike tank and the back pack at the fuel stops, or buy water at the servo I get the fuel at.nd I carry the bear minimum in the way of trail food and repair tools,remembering the narny has that handy toolbag on the rear guard.
the aus post ones have a handy phone pouch that attaches to the straps that I put my phone in for photos, rode nundle in the psssing down rain once and the phone stayed dry..
2.5 cents worth.
Boony