Here are some saddlebags I found browing through a catalog at Daddy's. Appear to be about the same size, if not a tad smaller than some. Surprised to see that, considering the intended mount. Quite durable, I'm sure.

GUNDERSEN SADDLEBAGS


Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black