Check out this highly rated AmazonBasics Internal Frame 65L Hiking Backpack with Rainfly for just $40.94 shipped (Retail $64.99).
This backpack has a water-repellent exterior coating, a water-resistant rainfly for light rain and a waterproof cover for heavier rain.
It also has adjustable straps, padded shoulder straps as well as an open-cell foam lumbar pad for lower-back support, extensive storage pockets, a large sleeping bag compartment and multi-directional compression straps.
Shipping is free with Amazon Prime or your $25 purchase.
**Prices can change at anytime.