Feminine hygiene products are an often overlooked item.

To be honest, we tend to not want to think about it, when we are not having our periods. However, I figure with everything else that could go wrong,
that would be when I start.

With that in mind we have packed sanitary pads.
One bag lasts about one period for me. This means a lot of storage room taken up for once a month. So, we started to look for an alternative and found a product called
Softcup.
The good: It is small. The plastic envelope is about the size of one thin pad, but the reusable one can be reused for the entire period. They can stay in for up to 12 hours. You can't feel it in you. I have a heavy flow and after I learned to position it correctly, I have had no problems. Considering that one lasts the entire period, the cost of the reusable Softcup is pretty close to my normal sanitary pads cost.
The bad: It takes awhile to get used to using, and to put in correctly. I used it and a pad for a little while to make sure there were no "accidents." You need to be in a seated position to insert and remove it. There also needs to be a source of water nearby (if you are using the reusable one) to rinse it out. Public bathrooms won't work unless you are using the disposable type (of course, you can just leave it in until later).
The ugly: It is
really gross to remove. You defiantly want water nearby to wash the Softcup and your hands. Ick.
Overall: I will pack a bunch of these in my survival kits, along with one bag of pads. I'll pack the pads for the first day(s) to make sure I have it in correctly, as well for someone else in the family. I'm not sure I would use the softcup every month in everyday life, but I can
defiantly see advantages to using and storing them over pads or tampons for WTSHTF.
Just thought I would share what I found.