Cupboard Hook for ELFA system

Having an ELFA storage system in the house is nice, but expensive to get new parts. Thought a simple hook would be good, but paying $1 or whatever seems overkill. Designed this hook to carry my backpack (or whatever) and fitting in the slots. After the first prototype bend a little, I reinforced it and it can carry easily 5kg now. Made it printable without support, the 2 thin walls between the hooks have to be broken out though!

Uploaded 2 STLs with more or less the same hook, only difference is one is 16mm and the other 19mm spaced, in case someone wants different sizes (needed fine tuning for the backpack handle myself ;)