I just finished the Camino - St. Jean Pied de Port to Santiago - with a Kelty Redwing 3100.
Your Redwing 50 is the current version of the same pack, but it is rated as one ounce lighter and 100 ci smaller than mine. Your side pockets are a little different (I think you can slide poles between the pocket and the pack) but otherwise it is pretty much the same pack.
My Redwing was just fine for the Camino. My wife carried a Redwing 2500, a 40 L pack, which also worked well. If I needed a new pack I might look for something lighter, but not much smaller. My wife's pack was big enough for her, but I carried a few extra things - the first aid kit, etc. A lot of forum members say, "don't get too big a pack; you'll just fill it up," but I didn't find this to be a problem. I had a little extra room, but that was fine.
If I were buying a new pack I'd also look into the packs which are narrower and taller for the same capacity; a lot of pilgrims carried Deuters like that and I wondered if they rode better. But, my Redwing did the job very well.
If I were to do another Camino, I'd stick with my Redwing since it appears to have lots of miles left in it. I'll be trekking in the Apennines next year, and plan to use the same pack.
Karl