Diem convict bivvy the diem convict 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 dimensions width 260 cm height 130 cm depth 225 cm diem convict bivvy bivvy pegs groundsheet carrystorage bag