About this 3D model

I had a topeak bike rack on my bike that worked with a bag but I wanted something that could function more like a trunk. Like a crate. So I made this mount. It slides in place and is held mostly with friction and the slight angle on the rale. I've taken this thing on bumps and it hasn't fallen off yet. Doesn't make a sound really. I printed this one at a decently high resolution and it holds up great!!! Not sure what it's weight limitations are but i haven't had any problems getting my groceries home.