GoLite Odyssey, women’s large. From this BPL review by Roger Caffin, it sounds like the women’s large is no different from the men’s medium: http://www.backpackinglight.com/cgi-bin/backpackinglight/golite_quest_golite_odyssey.html#.UU8_iLbaodo.

It’s been used about 10 nights, and had plenty of capacity for cold weather gear (including snowshoes, crampons, -20 degree bag, etc.) on overnights in New Hampshire this past winter. It’s in good condition, with some minor wear and stains visible on the extension collar visible in the last photo below. I'm selling it because the torso length is too short for me (I’m 5’11".)

It is a large volume pack, but with features that allow it to compress. The lid is removable, as are the plastic frame sheet and metal stays inside. It has also some straps that allow the lower part of the pack to be substantially compressed, such as the end of a multi-day trip when food volume has decreased. The sleeping bag compartent divider (a removable rectangle of material) is not included.

On my scale it weighed in at 52.1 ounces. From another BPL listing I took the following weights of removable parts:
Plastic frame sheet: 7.5 oz
Metal inserts for frame sheet: 4.6 oz
Pack lid: 3.4 oz

I'm asking $75 shipped CONUS. Here are some pictures: