Fins_N_Tines
WKR
IMHO, I would definitely go with the larger size... I've done 7 day + trips with the old 5500 and really wished I had a larger bag. (But my experience is based on the K2 version). I just personally always go bigger when in doubt.
Yes I would agree with you. Ived used the k2 3500 and 5500 and definitely was happier with the 5500. I just really like the horseshoe zipper and zip stretch pocket of the 4800, but I agree I think I would be disappointed with the smaller bag. I used a 6200 bag couple weeks ago on a 7 day hunt and I needed more space.