what bag would be suitable for loading 8x10? Links please.
You have to decide if you want a tent type or a bag type. I use a Harrison Jumbo (46″L x 28″W x 19″H) that came (used, bargain) from cinematography usage. This is like riding on a Roll Royce... but it weights 1.4Kg, so not for trekking

but perfect if it goes not far from car's trunk. A bag type is ideal for guerrilla warfare, for when you want no extra weight.
A major concern with dark bags/tents is dust, one has to be very careful with that !!! To clean the inside, I first clean the room air with an HEPA air purifier and later I blow it well. Also when introducing the film box and the holders one has to sure that not much dust is carried inside the tent, outdoors we may have not much dust, but inside a car we may have a lot. Of course the camera bellows inside should also be kept clean in a similar way. A 5mm long dust filament in the middle of a 8x10" sheet is something painful

You remember that for years...