Carp kinetics 3 rib bivvy the carp kinetics 3 rib bivvy is a great piece of kit super spacious yet easy to erect pram style bivvy its 1 000 mm pu coating ensures you will remain completely dry no matter how hard the rain falls and the three rib design means stability is guaranteed it comes with a detachable pe groundsheet a set of pegs hard wearing bag carp kinetics 3 rib bivvy 1 man design material 210d nylon pu backed for breathability and waterproof 2000mm hydr