I guess I'm hard on stuff. I bang things around, stuff falls over, or gets caught on things.

I have a pair of Detours panniers that I've broken several times. I busted the part that clips to the rack at the bottom, and I've broken the hangers that clip to the rack. I ended up using wire to attach them. Then they pulled through the material. I put big washers on the bolts to fix that.
But now the clip itself is broken on one to the point I can't hang it on the rack any more. I can't get replacement parts as they changed the design.

I need something that will last more than a year.
I'd also like water resistant. I live in CA and commute 8 miles, so I don't need monsoon proof, just reasonable.
A carry strap for off bike would be nice.
Compression straps a bonus, but not required.
I carry a laptop, clothes, lunch and school papers and sometimes other junk.

Mostly I need something that won't break. I'd love it not to cost a fortune, but maybe that's just wishful thinking.

Hints???