I've been searching for one for a long time as well. Something like a neoprene laptop case that you could slip in a couple sheets of gatorboard to protect the glass would be ideal.
I have a few plastic "document boxes" I found at The Container Store" that are about the perfect size for 8x10 backs. Your results may vary depending on the size of your back. There are a number of photographic items at this store.
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