If you are using butane gas and the air temperature drops below 1ºC the butane will not gas. To get it to do so, shake the cylinder. A better idea is to use propane all year round.
Lining your fishing tackle box with foil helps to prevent rust damage to hooks and other equipment.
Use as many disposable products as possible (plates, cups, utensils, etc.) and clean-up will be quick and easy.
Dip your matches in nail polish to waterproof them.
Pack your toilet paper in a used tin then snap on the lid to keep it dry.
Cut a hole in the bottom of a black bag to get your head through, it makes for a good emergency poncho.