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Picked up one of these old style Osprey Exos on sale for $100.
It's super light, and the frame keeps the pack of your back, so you stay cool and don't soak your bag in sweat. I strap my folding pad under the pack, and I can fit a wool blanket between the pack and the top lid if I need to.
The external pockets are easy to use, and you can reach your water bottle from the top or the front of the pack. You can also lash your trekking poles to the pack if you need to.
Pretty good for a lightweight minimalist pack. I've packed it full and it was still very comfortable.