I am doing about 100 miles of the SHT this Fall and looking at Osprey Kestrel 48 and the Flash 55.
I am used to 1-2 nighters with an old Jansport 40L internal frame pack. I got fitted for both. Flash fit well, but seems "fragile" compared to Kestrel.
Is the Kestrel 48 big enough for 6 days?
My favorite is on sale now, I've used this for up to 10 day trips with no problems. It's kinda basic, but works for me. Very comfortable. I'm even thinking about buying a new one since they're on sale, even though mine isn't worn out yet.