The updates to the new bags are excellent. I love the horseshoe zipper for accessing your gear. Moving the bladder access to the outside of the pack is so functional it makes me wonder why anyone would put it on the inside. I also really like that the bladder sleeve is oversized and lined with silnylon so you can use it for wet storage (rain coat, tent fly, etc). The water bottle pockets are bigger. And when the volume is sucked out of the bag, you’re left with the whole horseshoe zipper accessible from the front and about 3” of depth making a perfect day bag.
Considering they are the same price, I think the benefits of the 4800 vastly outweigh the bump in capacity for the 5500.
The 4800 is everything I want in a hunting pack and I can’t wait to run one this year.