This is an REI brand internal frame backpack, purchased from REI. Pamphlet included. Used on one two-night backpack a few years ago. Glad to send more photos or take additional measurements.

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Front zippers are heavy-duty waterproof, but I have a large never-used Duck's Back backpack rain cover to include for this price.

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I don't have original details on capacity, but based on my approximate measurements, the pack is roughly 55 liters in capacity or approximately 3380 cubic inches (26Lx13Wx10D). It weighs 4 lbs 4 oz.

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In appearance alone, it most closely matches the Osprey Atmos AG 65, but it has a smaller capacity and is slightly less heavy. See this picture at: https://www.rei.com/product/201302/osprey-atmos-ag-65-pack-mens.