Try the REI UL Cruise. I have one & they are both lithe and tough, the newer version being made W/ Dyneema cloth (Nylon W/ Dyneema ripstop threads).

The pack is around $130. & you can buy REI side pockets & short Fastex buckled straps to attatch them if you need extra room.

I've used this pack on many trips and love it.

Eric
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"There are no comfortable backpacks. Some are just less uncomfortable than others."