These bags are made of super strong flame retardant silicone fiberglass woven fabric and will stand very high temperatures for a reasonable period of time. The bags are stitched together with an extremely strong fire retardant thread and the flap is secured in place with hook and loop tape.
Ideal as a lipoly charging bag but superb for encasing your battery when it is installed in your model if the untoward ever happens.

Specs:
Material: Flame retardant silicone fiberglass woven fabric.
Length: 120mm
Width: 65mm
Height: 55mm
Weight: 28g