"Looks good but has severe flaws - returning it"
The back pack is light, made of good materials and has a good price (comparing to others).However, I had a feeling that somebody attempted to copy a good design without good understanding how it works. The least significant but funniest flaw is that it has a whistle that is almost within reach of the mouth. The biggest flaws are that the water bladder is loose and backpack should perfectly fit (no adjustments!). Three available sizes don't look to me good enough to fit everybody. Also, it may not fit both summer and winter cloth.Bottom line is that it is definitely much worse design than Ultimate Direction (I've got now) that is $150. If you really would like to try to save this $50 – this back pack worth looking at. But you absolutely have to fit it – preferably with water bladder.