Awesome, as luck would have it we have still have a big canister of helium from a few weeks ago. I knew birthdays would come in handy somewhere along the line...
i put mine in a mason jar with silica gel packets from shoes or beef jerky - it absorbs moisture and oxygen i believe.
Haha! I used to store acid in CD cases too.. :afro: Although I don't think I've ever held onto any acid for more than a couple months.
What about like, the holes around the edges? Surely CD cases aren't airtight. At least in a ziploc bag there's a full seal.