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A few years ago we were setting up an ad hoc darkroom, where we had to blackout a window and a door. My wife, who is expert on all things fabric, found some 100% blackout curtain at a curtain shop. We put that on rails and hooks, and it worked fine for quick setup.
At the telescope, I use the dark cloth that I had with my 4x5 camera kit, now unfortunately sold. I don't remember how I got it, but I'm fairly sure I purchased it from a camera shop. This works very well to block out the nasty lights from a neighbouring building.
The bag that you mention is a dark bag, commonly used for loading film into cassettes, into large format dark slides, or into a development tank. The latter makes it possible to easily develop 35mm and 120 format black and white film without a darkroom. I still do that occasionally, and then scan the negatives. I've had mine for a long time, but I believe that such bags are still not too hard to find.
Regards, Andrew
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