This is a Dedolight Hi-Temp Pouch for storing a DLH4X150 fixture. Hi-Temp Pouches are made from Supersil -- a space technology textile material which can withstand temperatures up to 2000°F (1100°C). Use the pouch to pack a hot soft light on the run, and to protect the soft light's glass tube.
This pouch is large enough to store a DLH4X150 fixture,
which measures 8.9 x 6.1" (22.6 x 15.4 cm).