In the bad old days, you would have taken an empty 12ga shell, cut the paper away from the high brass base, slipped this as an end cap over another empty 12ga shell, and waxed the package to seal it. <br><br>Your matches/cash/meds etc were safe from weather and could be accessed in an emergency by slipping the end off after scraping the wax off with a thumbnail. <br><br>Should work with plastic shells as well I guess - though not exactly disguised as an urban gadget where this thread began!<br><br>For a more urban look why not use an empty poster pen (the aluminium cased ones with the fibre tip, like an oversize felt pen).