Size is irrelevant. What you do with it is.

I'd be inclined to agree with Hike that this pack is on the small side, but I also carry over a gallon of water in my BOB and need space for cold weather gear during the right season. People who don't/can't carry as much weight and don't need the space could very well find this a doable pack. My bug-plan is also about a 80 mile trip in Vermont- my BOB wouldn't have as much water or carry a cold weather sleeping bag if it was a 20 mile trip in, say, Georgia.

My main concern is the construction. But I'll be the first one to admit that my opinion of ultralight packs is very much colored by some spectacular failures that I've seen. If you don't have to push through close vegetation, it's fine.