[Old Dog New Trick]

Mugwumps (all)

Don't know if it's been said but, batteries and for that matter all things that can be ignition sources like a butane lighter should be wrapped in nylon tape (electrical tape) as a moisture barrier to prevent corrosion.

If you wrap lengthwise at least one battery in a flashlight it will prevent any electrical contact or accidental contact and drain on the batteries.

Same with a 'bic' lighter. Moisture and condensation are enemies to flint and metal.

I also wrap my magnesium fire starters in electrical tape - one to prevent wear, second to keep the striker from falling off.

As Reaper said food in a plastic container.