…is not to stuff cotton balls into whatever container you may use as tightly as possible.
It is simply packing a tampon, or a piece of it that you have cut off.
You will never, ever be able to compress as much cotton into the same compact space as a tampon holds. Peel off the outer “silk skin”, pull it apart until it becomes all fuzzy, and you get a whole handful off finest cotton fibre tinder!
If you put one third of a tampon into your spy capsule you have at least as much cotton as you could cram into the whole capsule in the form of cotton balls, and you can use the saved space for additional steel wool, for example.
Go ahead, pluck one apart and be amazed at the amount you get from it! Absolutely unbeatable.
Cheers,
Matt