I use this to unload film from my Holga 120n modified to use 35mm. This does exactly what it's designed to do, create a dark room for changes.
The zipper at the end of the bag zipps in one direction. Then there is a 2nd bag/zipper that zipps in the opposite direction. This helps prevet simple light leaks at the end of the bag. The material is nice and thick, and folds up nicely. A bit too big to put in a typical camera bag, so I leave it in my car until I need it.
The arms are nice and long, goes about half-way up the forearm. And the ends have a very snug elastic band to make sure they stay in place. Might be a little tight, but its better safe than sorry. Seems very well made and will probably last a long time with normal use.
A suggested addition would be a little carry bag with draw string, just to keep it tidy when transporting.