Harald Nyborg Drybox Clip
thingiverse
Everybody is making IKEA clips too. This one fits the Harald Nyborg storage boxes perfectly, no snap lids needed - just lay it on top. They're super cheap (35 kr) and really big (50 liters or so). You can make them 100% airtight with some basic weatherstripping (Harald nyborg also sells this, get the E profile for best results) and wrap it around the lid area. Just print 10 of these (or fewer if you prefer, I use 10) and snap the lid on tight. These clips stay tight thanks to the weatherstripping, so they might be a bit loose without it.
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