Jetboil 1.8L Spare Cup

Moosejaw says:
Features of the Jetboil 1.8L FluxRing SpAre Cup Flux ring cooking cups with insulating cozies Bottom covers double as a measuring cup and bowl Compatible with SUMO, Sol, MiniMo, Zip, Flash, PCS and GCS Companion cups Are compatible with Jet boil systems only Do not use with other heat sources, as it will void the Warranty Can pack a 100g or 230g can of fuel and burner base with room to spAre, or a complete Sol Zip system with 100g fuel Also stows a 450g fuel canister Drink-through lid with pour spout and strainer