Disposable Raincover with Flash Pocket ( Pack of 2)
This raincover is great in an emergency. Simply slide over the camera with your external flashgun attached and use the draw-card to cinch it tight around the end of the lens.
It’s large enough to take a lens up to 300 mm long ( that’s 300mm physical length, not necessarily 300mm focal length).
If desired, make a hole for the viewfinder and use the camera viewfinder eyepiece to keep it in place.
Weighs only around 35g.
Packs into the smallest of places, so you can always have one with you.