Mido Holders For 8x10 Work In Asia?

I might use the Mido adaptor type 8x10 holders for the coming work with the camera in Asia. The holders will dramatically cut down on weight. There were some light leak issues with these cute devices, I will need to test them before deciding whether to use them or not. I own many of these light wait holder, bought them many years ago for my planned eventual work in the field in Asia with an 8x10 (saw this coming for over 10 years). Here is what the holders look like.
Mido Film Holders Blog