I have found that just about any of the OTC containers, once you remove the inner foil seal, do not work well to preserve and protect the contents from humidity, oxygen and permit them to loose effectiveness fairly quickly. This is especially true if they are carried in a kit and subjected to changes in temp. and humidity.

The solution that works for me is not a med. container, but match cases, specifically the orange plastic screw top ones with the black plastic/rubber ring between the top and the case. Made by Coghlan's (no affiliation) and probably others. See: http://www.coghlans.com/products/plastic-match-box-8746

It holds a reasonable number of pills and keeps them safe and dry. A bit of duct tape and a marker will label them for you, or, as I do just mark the top.

I have yet to find anything better in any "made for the purpose" pill case, all of which seem to let more or less air into the case causing the meds to loose effectiveness quickly.

The only other realistic alternative is the individually sealed foil packets of pills.