I don't have space to place a large bin so I was looking for a way to hang these bags for plastic trash on the inside of a door. The solutions I found online were not strong enough for my use so I made my own.

You can place the empty bag over the edge of the base and put the top on it. Friction will keep it in place. There is 0,6 mm gap for the bag to fit in once the top is on. It fits the thin yellow bags shown in the picture but it also fits the thicker black trashbags we have over here.

I made the first version (shown on the pictures) but it turned out to be a bit on the small side and you have to glue the brackets on which is annoying. 

I made a V2 where the opening is bigger, the brackets are a bit bigger and have holes for screws. I haven't tested V2 myself as I didn't want to trow away a perfectly good print. Be careful with V2, it might me too large for your printbed and the brackets are not the same. There is a left and right one. The brackets have a chamfer on the inside so they don't interfere with the opening.
 

Opening sizes
V1: 166mm
V2: 218mm

Screw hole sizes (V2) → Change the size of the holes in the slices if necessary
Base side: M3 countersunk bolt
Wall side: 5 mm wide hole

I was also in the proces of making a lid, but I decided against it. Let me know if you want one anyway.