This is my pack for winter loads, and heavier 3-season loads. There are no corresponding attachment straps for the 2 tool loops, so you have to make your own with either velcro, or shockcord and a cord lock. My winter gear list sucks, so i ended up carrying around 38lbs for an overnighter, but the pack did it in comfort. I was able to easily strap my ice axe, crampons, snowshoes, snow shovel, and CCF mat all on the Outside of the pack, simultaneously. Surprisely, with all that junk attached, the pack was still somewhat streamlined, and the balance was good. The compression straps that run across the front of the pack, over the vertical zipper entry, are perfect for carrying the extra CCF you will have to bring for insulation. I still had a lot of room inside the pack, and could have easily brought enough food to sustain myself for 3-4 days. I shot a video of the trip (Mt. Baldy, CA) maybe i'll post it in the trip report section sometime
*oh, also, i have no experience with it personally, but from the specs and weight given, it looks like a ULA catalyst would be great for winter trips