Not OP and I realize I'm 5 days late, but I get my film from Adorama for more specialized films, Meijer (supermarket) if I just want a basic roll to shoot. Memphis Film Lab (in Euclid, OH) is my developer of choice these days - I've also tried The Darkroom out of LA, but I wasn't super impressed with the scans (and that seems to be a common sentiment).

I was also considering the LTT backpack and ended up going with the Everki Atlas (EKP121, the larger version). It's only been a couple weeks so far, but the brand comes pretty well recommended, there's a lifetime warranty, and the build quality definitely looks/feels high quality. Good water bottle pocket too, the biggest problem with my last backpack was that the water bottle pocket ended up just being stretched elastic that doesn't really hold the water bottle well.