There are reasons I'm making my own. One is that I don't have more than $25 to put out for this at this time, and I found some discounted thick black cotton fabric that would work really well for $4 or $5 per yard.
Hi Stephanie,
Heres my suggestion, having used and gone through allot of things.
Make your dark cloth as functional as possible. That means breathable, trust me, you don't want a jungle under there fogging up your GG and dripping sweat in your eyes while you're tryng to compose and focus a masterpiece. It can be plenty bad enough with one that "breathes" Make it two layers, black for the inside and silver or white for the outside (white on the outside makes a huge difference), with some weight in the corners so it doesn't blow around as easy. Some people use velcro in such a way as to be able to stick the the dark cloth together around the "hole" over the GG.
To protect your camera from weather, get a small, cheap, lightweight, and waterproof tarp and a couple of office clips to hold it gathered. The cheapest, smallest, (and cheesiest) of the blue colored tarps at the big box home store is what I use. They fold small, I carry a couple for "whatever" in my jeep.
If you sneeze under there, well, that can be a problem.