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A companion to my last generator. This one makes cylindrical screw-top containers, with configurable dimensions and beefiness. And threads figured out for you.
https://www.printables.com/model/781549-parametric-easy-screw-top-container-maker-freecad-
(You could even store your ~~weed~~ KLR valve shims in it.)
Edit: This just received an update. The cap now generates with grip crenelations in it.
...in which case there is still no guarantee, but the odds of it being waterproof are greatly improved.
Joking aside, great model, I'm sure I'll find some uses for this. Thanks.
Even without they're pretty darn resistant, and proof against rain or, e.g., dropping one in a puddle or off your kayak and then fishing it out immediately. Just don't try to use one as a time capsule that'll be exposed to the elements indefinitely, or expect the contents to survive being immersed forever at the bottom of your aquarium.
They're definitely not airtight, either. Which may be a factor for storage of your... herbaceous materials.