Replacing membrane on case

Hi,

I am having trouble with the membranes on the Audiomoth case getting holes in them (sometimes as wide as the actual opening in the case) which has led to water getting in some of them. Over half of them had holes after retrieval (14 of 20). Is there some sort of stronger/more durable membrane that could be used? I've seen a bunch of threads on this so I know others have had this problem as well.

Also saw that you can now buy your own replacement membranes, but they currently are sold out on GroupGets, and anyways I am already in the field (very remote) and need to re-deploy them. What would you suggest using as a DIY fix? Tape? Plastic from a ziploc bag? Any rec's would be much appreciated, thanks!