Jetboil Flash

Boils a liter of water in 100 seconds flat. The Jetboil Flash's integrated cup-and-burner system nests into itself, taking up less space than a Nalgene bottle. The color-changing heat indicator on the neoprene sleeve tells you when water is ready without lifting the lid. For coffee-dependent backpackers — which is all of them — this is the single most important piece of gear in the pack.