Dianyla has some good points. I'm not as short as you are, but I really resent carrying more than absolutely necessary, so I know what you're talking about. Hiking in 7 miles isn't that far, though, so you can probably take a little more than the bare necessities for comfort in camp. I guess you'll ve taking day trips from camp?
I have an Arcteryx Bora 75 too (which is 62 L in my size, THAT they didn't tell me in the store...
) that I like, and my best camping girlbuddy has a Gregory that she's completely enamored with.
Random thoughts:
- clothes: For short trips I try to figure out how many layers I'll need for the coldest (and wettest) weather I'll meet. Then I add what I HAVE to change after a hiking day - eg. socks and a sleeveless base layer. Everything else is basically a luxury. For a 4-5 day trip I'd want to have an second base layer for day trips, even if it were wool. I sweat a lot 
- tent: I'd never carry a tent just in case. Can you find out in advance whether you can share or not? Tents are heavy.
- sleeping bag: down bags are great, but are happiest if you can hang them out to air/dry for 15-30 mins every other day or so. The weather forecast should tell you if you'll have enough dry weather to do so.
- food: food is heavy. Hot food is to my mind MUCH better than cold food. I also like having hot drinks available in camp, I need a lot more heat when living outside. I'd go for a stove (shared with someone), fuel and freeze-dried dinners. They're expensive but very lightweight. Otherwise I usually eat musli with powdered milk and hot (!) water for breakfast, energy bars and sandwiches for lunch. I haven't found anything I like enough to replace bread, but I have found a truly brilliant wholegrain musli bread, full of nuts, dried fruit and raisins, with the consistency and weight of a brick 
- water: filling a water bladder thingy from a stream can be a little tricky. But someone will probably have a cup or a solid bottle.
Have fun
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett