Thanks for the quick reply. I saw that little sack and did not even consider it was for the bladder. But I see the hook to hang it on now. I do not think it is a very good design. I have not used it yet but the shape of most bladders is a longer narrow shaped rether than the square shape of the little sack in the pack. Imay have to buy a different bladder like a Platapus or something smaller.

Thanks alot