Cracked the code - vacuum sealing bags
On a whim I tried a strip of vacuum sealer bag material on the open edge of a regular baggie. Since half the $50/box vacuum bag is flat I figured the diamond grid must be the operative surface, so laid that inside the opening of the bag and it worked just like the more expensive cousin.
The pricey bags are boilable and machine washable where normal bags are not, but who the hell washes bags. The benefit of this approach is that using a 1" strip instead of the whole bag will make one box last 10-15 years or more I would imagine.
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