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clamp to close the ikea samla boxes more tightly, if you put a rubber band around it you can make the closure airtight
The box itself is not watertight, so you have to put a rubber strip or similar around the entire edge so that the clips grip more tightly and remain sealed, e.g.: https://es.aliexpress. com/item/1005002531941543.html
I had it like that for a season and it worked well.
If you are not convinced, use another rubber-type material that is more watertight:
https://es.aliexpress.com/item/1005004538431159.html