That's quite a lot of stuff in a pen. Packaging is everything. I would love to see pictures if you can find someone to post them. Only problem I see is the puritabs. If those are the iodine type then how do you keep them from going bad. The Iodine is veeeerrry reactive and will simply oxidize in the air if you don't have them sealed air-tight. Also the iodine will usually react corrosively with the foil and other metal items in your kit which may make them less usefull. ( I suspect that it would take quite a bit of iodine to compromise even the smallest amount of metal but it will react. It would probably weaken the foil some.) Iodine will also "melt" many plastics. All this being said, I carry my Iodine tablets in a 1/2 length tube from a bic stick pen. They seal air-tight when you use the plug from another on the open end and are exactly the diameter needed. This pen is made from polypropylene according to Bic and I have had no evidence that the Iodine reacts with it. I am still looking for a way to test the effectiveness of the iodine that has been stored in this way. Short of having some petri dishes and agar I don't know how to test this sort of thing. I may have to order some from Edmund Scientific.