I've been having some issues with my worm binder rings popping open right when you don't want it to. my solution to this was simple.
1. get two short pieces of heat shrink tube. used for wiring about 1/2" long
2. slide over one side of each ring.
3. place bags on rings as desired.
4. close rings.
5. slide tubing over ring lock areas
6. heat to shrink
be carefull with the heat as it will deform the storage bags too.
this will prevent the rings from comming open, when you need to open them, just cut the heat shrink off and then re-do as necessary.
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sounds like something I will try on mine 
