Jetboil 1L Tall Spare Cup

Outdoorplay says:
The Jetboil 1.0L Tall Spare Cup enables you to save weight by sharing your burner base and fuel with friends. Patented FluxRing technology makes it possible to heat with extremely high efficiency directing it into the contents of the FluxRing cup, rather than into the air as waste. FluxRing hard anodized aluminum cooking cup Drink-through lid with pour spout and strainer Flash insulating cozy with cargo pocket Bottom cover doubles as a measuring cup and bowl Can pack Zip, Flash, Flashlite or Luna burner base with one 100 g JetPower can (not included) Compatible with MicroMo, MiniMo, Zip, Flash stoves and Luna burner