Arc'teryx RT45 Backpack - 2258-2624 cu in - 2006 BCS

This pack is great! My previous pack was the Mountainsmith Auspex. This pack is as good or better. The load I carry is 33lbs. and when you put it on your back and adjust it to fit, it sticks like glue while on the trail, and is very comfortable. I found the pack to be very roomy for what I carry, (winter backpacking in Central Texas) and the extra pocket roomy enough for rain gear. The only problem I had with the pack was the side water bottle pockets weren't big enough for a 1 liter bottle. It doesn't matter though, because you have the hydration sleeve inside. Everything considered a very good pack. Lifetime warranty too.

Excellent pack; great space; could use more zippered openings on outside, and side pockets not deep enough to hold, say, a Nalgene bottle. Overall, a good pick with solid support.

Excellent backpack. I own the RT35 and 45 and have found the 35 is not big enough for multi-night trips. The 45 can get me out for 3-4 nights with its extra carrying space (the difference is really in the ability to carry additional food and fuel). Unlike most 45+ liter packs, this pack functions well as a daypack, as it is relatively lightweight and does not have a massive frame. The 45 is good for loads up to 40lb.

The top of the backpack is designed to carry climbing rope, but this function works well for carrying gear like a pad or tent, thus the pack can really handle about 55 liters of gear. The pack cleans easily if you spray it down with water after trips.

If you are struggling between the 35 and 45, go with the 45. For small loads the difference is almost unnoticeable, but the 45 takes better care of you for large loads.