My friend makes a lot of ByAnnie bags and she suggested this tape from Wawak.
https://www.wawak.com/garment-constr...ear/#sku=tpe29
I have some but I haven't tried it out yet. I've only used the washable before on garments for zippers and other things. I haven't had trouble with any of those holding until I've stitched but as I said, I've only used them on garments. I second keeping it in a ziiploc. Especially if you live in a humid climate.