The revolutionary Jetboil system just got easier to use on group trips thanks to the Jetboil Companion Cup. Just purchase the new FluxRing enabled cup and you can get an extra mug so you can share your burner base and fuel with friends, and the companion cup comes with some great upgrades too. The neoprene cozy makes sure the mug is never too warm for your hands. A window on the cozy turns color as the contents warm up, and a transparent lid and bottom cover let you know what's going on inside. Designed to be compatible with PCS/GCS systems and flash burners this one liter cup is fully integrated with the FluxRing heating system. You'll be sure to be prepared for meal time with the Jetboil Companion Cup.