More Camp Shopping

I need to find some sort of thing in which Katie can keep her Imitrex inhaler all the time while at camp. If she does­n’t use the inhaler in the first cou­ple of min­utes of a migraine attack, it does­n’t work. This the­o­ret­i­cal con­tain­er needs to be rea­son­ably water-resis­tant because she’ll be on the lake at times. I’ve seen var­i­ous things intend­ed for keep­ing keys or wal­lets in while swim­ming, but most hang around the neck—not accept­able. Too like­ly to get hung up on some­thing. A real­ly, real­ly small fan­ny pack would work. But all the fan­ny packs I’m see­ing in camp­ing sup­ply or sim­i­lar places seem to be super­sized. The ones designed for kids, while the right size, are pieces of crap. Does any­body have sug­ges­tions that don’t involve order­ing some­thing to be shipped here?