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Pic related, Glass bottle master race.
Sleeve protects it from damage, take it off and you can boil water, choose a solid sleeve to keep light out and protect from developing a taste in the sun.
If your situation becomes dire you can break the top off, use the bottom as a cup (can still boil water) and the shards you got from the top to make a spear to kill moose with and a knife to skin it.
