Cormax Grenades CorMax Grenades are a super tough bag, filled with air and water. Take them anywhere, they are compact and light with each Grenade weighing less than 1kg. Just find water, fill, pump and you’re training. CorMax Grenades are perfect for cardio and high intensity interval training. *The Grenades come as a pair. Size: 16cm x 28cmHolds: 6kg water (each) Available colours: Black or Grey/Silver Other colours are available, please get in touch for more information.