My wife has about a thousand of these little plastic cups left over from chocolate pudding. I was looking for some way to store the projectiles I buy in bulk once I count them into lots of 100. It occurred to me these little cups were just about the perfect size for that. I know a lot of people use ziploc bags, but I've had bad luck with ziploc bags for long term storage since the WVTR (water vapor transfer ratio) is too high and these bullets could be in storage anywhere between months and decades. I have covered the cup with a 3 inch square of package sealing tape. Note that the bullets do not touch the tape. Then it occurred to me that I didn't know if there was anything in the tape that would produce vapors as it aged that would hurt the bullets. Anyone have any experience along these lines or are these bullets about to magically transform in front of our eyes into guinea pigs?