I was looking at some packs and I was having trouble picking the liter. I know that I'll need to pack a sleeping bag, tent, clothes, food, and extra gear. And because I'm unsure of doing mail drops, I am planning on hiking with everything for each season as a precaution. With that in mind I still have to pick a pack liter. I currently have a outer frame pack but I'll be looking for a inner frame pack. I was thinking of getting the Osprey Xenith 105 Pack because of the pack size and how much it can store. But again, I'm unsure. The AT is going to be the longest hike I've done so I'm just unsure on how much I need. So I'm curious if 105 might be too big. What Liter have you used before and suggest, and do you personally think that the Osprey Xenith 105 Pack is to much?