Good Ducttape is sticky,& that adhesive is going to move around before too long,even wrapped up in cellophane or foil.If you set it into a tube of sorts,how easy will it be to extract?The creditcard idea is Very practical,I carry mine this way in 2"x3" mylar bags.The added benefit of having your name/info on the cards,could aid in SAR efforts on the + side or even CSI if you were ambushed/hijacked by Banjo playing zombies or something.