Gerber Baby Food Lid
thingiverse
Gerber baby food lid, may work with others i really dont know what else is out there like this... its designed to slide on from the side and hold down the foil, it may not be spill proof but i can definately turn it on the side and it wont come out in a reasonable amount of time, wouldn't leave it upside down for a week...i find it usefull hope you do too...
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