A reversible quick connector tho hold bags or other stuff.
The hooks snap in very pleasantly and can take quite a bit of force.

You may use it in conjunction with: 
Walters Customizable Tri Glide with broken edges and eyelet
http://www.thingiverse.com/thing:45219
TODO: add printables link once migrated too

Instructions

Keep the U hooks long and thin enough to flex.
Print two U-Hooks one Snap-in-Unit and two Lock-Blocks.
The lock blocks should stay in by friction.
If they don't then use adhesive tape to hold them in.
Ok, there's room for improvement here.

Use "customizer" for deviating sizes (thingiverse).

Category: Other