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As a follow up to the last installment of Outside the Box, a couple notable uses for the ubiquitous 2L pop/soda bottle that didn't get covered in the comments.
Fish Trap
Via Black Scout Survival
A scavenger's take on the basket fish trap. Easy to make, set and forget. Small fish aren't exactly a filling meal, but they work well for catching larger game.
MRE Heater Bomb
MRE heater(s) + water + a 2L bottle = loud boom. Don't try at home, kiddos. More of a distraction device than a weapon, though certainly not something you want to blow up in your face.
