Dead simple bag clip, with its step (parametric) model, so you can print it in any dimension you wish.

Here's the onshape project if you wish to remix it ;)

https://cad.onshape.com/documents/4140447b2542a8a144895273/w/c1df6f0887651dc79eedc7e5/e/81b1248426e44bcced9a800e?renderMode=0&uiState=68405b711ddc113c49940ca4