For small kits I use miniature zip bags. Often electronic parts come in them. I found a bunch of them at a local antique show and flea market. A stuff dealer had them bagged in 50 and 100 bag lots depending upon size for a couple of bucks. The ones I got were 3/4 X 3/4 on an inch and some 1 X 2 inchers. Very handy for a number of uses. The dealer had a number of different sizes available.