I have been experimenting with this problem as well. I currently have done this and I am watching and waiting for results. I took two bic stick pens and cut one down to fit into my altoids can then filled it with iodine tablets which fit exactly into the tube (use the larger pen with a flat cap) about 10 fit in the length I cut. then I liberated the cap from the other pen and stuck it on the cut end of the tube with iodine tablets. This has been sitting in my kit for about 3 weeks with not evidence of iodine leaking out and afflicting the other contents - recognizable smell or yellowing of the other contents. I am not sure what the material of the pens is but would be interested if anyone knows. Seems that this configuration is quite air tight and holds the tablets safe from impact and fracturing. I am not sure if they are interacting with the inside of the tube and losing potency or picking up contamination. Any info?