Made from an old barrel grill someone left at an apartment complex trash dropoff, and some aluminum pipe from a weather-destroyed small greenhouse. Besides some basic tools like wrench for bike wheel nuts and drill + drill bit to cut a hole in the pipe to fit on the wheel bolt, all I needed was a little welder to fit an attachment point behind the seat stem.
Included are some images of options I considered before realizing my best path forward. Make shit up and use trash to do it!
It’s more about saving width close to the ground. It doesnt matter on all trails, obviously, but a single-track through a shrubby/grassy area or a trail that’s deeply rutted will be a big pain if you have wide panniers.
I’m not exactly sure what you gain with a seat post bag vs just a bag on the top of a rear rack, though. I guess it is lighter.
Ah, that makes sense. Thanks!