Carry an ultralight camping stove in your backpack

If open fires aren't allowed where you camp, you'll need some sort of stove to prepare your food.  The Ultralight Backpacking Canister Camp Stove with Piezo Ignition, plus a canister of gas, is all you'll need for cooking.  The stove itself folds up into a small package, as seen in the upper left and right images.  It only weighs 3.9 ounces when stowed in its protective case.  Open it up, screw it on to a small fuel canister, and you're ready to cook.  The ultralight stove, as the name indicates, has a piezo ignition and an adjustable flame that can even simmer.

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