If you (or anyone you know) get contact lenses from Specsavers, they send out a replacement lens container every three months:
These are just about the right size for small friction matches (swan, for example). There's a little plastic square that has to be hacked out of the lid, and they aren't completely waterproof without the addition of a washer (a piece of bike inner tube in this case). This took me about 2 minutes to make:
These are just about the right size for small friction matches (swan, for example). There's a little plastic square that has to be hacked out of the lid, and they aren't completely waterproof without the addition of a washer (a piece of bike inner tube in this case). This took me about 2 minutes to make: