
Corradobrit
No, haven't opened the storage tubes. And yes I will need to apply silicon sealant to the zippers. But not sure how a zip can be airtight. Water tight... definitely .PS have you put anything in the storage tube? The zip needs to be lubricated from time to time to ensure you can do it up properly for an airtight seal. The guy you bought it from may not have done (especially as he didn’t know he had that option!) that so might be worth checking
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