Adapted from this design:https://www.printables.com/model/201357-wire-shelving-hooks

I shortened the length to meet the needs of my upside-down backpack sprayer.

Printed using CoLiDo's gray PLA+ filament. It seems to be able to withstand a weight of 10 pounds. I can't comment on anything beyond that weight, as I haven't tried it yet. I only used a 50% infill rate and 4-layer walls.