I have the BTZS tube and a more conventional silver/black cloth made by Harrison (the film changing tent company). The Harrison model has velcro at one end so you can wrap it around the camera. My preference is for the Harrison because I found the velcro zipper on the long axis of the BTZS tube annoying. Personal preference I suppose. Darkroom Innovations sells the BTZS. Badger Graphics carries the Harrsion.