That’s pretty cool! Can’t imagine it fits in every spool though.
After reading these comments and thinking about it, I’ve ordered some silicon sealed cereal containers and some 100g color indicator dessicant packs. Decent dessication seems more important than fussing with bags and vacuums. After investing in the bags and now all these cereal boxes and pricey dessicant packs, I’ll admit I’ve thrown way more money at this issue than I had expected to, but hopefully it’s an easy to use long lasting solution to protect my filament library.