Team Carrington

Me = 17 Parents (combined age, they wouldn't let me put their ages ) = 100

E-mail sent from Lancs. England

To be honest, if the cache involved a overnight walk to reach it, I would think that matches are acceptable. Surely if any "small" children did find it after an overnight walk, they would have been exposed to a stove etc. and have an idea of fire safety. Just my tuppence

If your worried about it cutting people if it breaks, you could always cover the jar in clear (or coloured for como) sticky back plastic, that way, if it does break the plastic should hold the shards together

There has always been a bit of debate as to whether mobile (cell) phones can cause problems like the ones you are experiencing. Worth a try?