There are also many many other packs that are now Camelback bladder compatible. I have an Osprey that I use for both a daypack AND a backpack (it is lighter than either of my day camelbackpacks) However, while the Ospray is known for its light weight, it is less padded than my heavier packs, but, BUT, BUT
because it IS so much lighter, I find that I don't need so much padding as before. It is the "Official" pack of the Goatpack (our hiking 'gang')and none of the 5 of us would trade that pack for anything on the market right now
(we also endorse the Marmot Precip jacket and the Feathered Friends Down Booties
The body betrays and the weather conspires, hopefully, not on the same day.