light weight backpack

Hi, looking to get a light weight pack mainly for use when packrafting.
Main criteria is for
dry weight = wet weight (ie doesnt soak up the water like my current pack)
around 70L and needs to be able to be comfy with 15-20 kg
external straps for raft/paddle
able to cope with being thrown around/bush bashing/ bouncing of rocks
The ULA range look good - If anyone has the CATALYST or Circuit I could have a look at in Sydney of the Blue Mountains drop me a line
Any other suggestions?
cheers Kelvin
Main criteria is for
dry weight = wet weight (ie doesnt soak up the water like my current pack)
around 70L and needs to be able to be comfy with 15-20 kg
external straps for raft/paddle
able to cope with being thrown around/bush bashing/ bouncing of rocks
The ULA range look good - If anyone has the CATALYST or Circuit I could have a look at in Sydney of the Blue Mountains drop me a line
Any other suggestions?
cheers Kelvin