There are also some neoprene cases that are just for storage (
like this one) I have a couple of these, but I don't use them very much. I think I only paid 3 or 4 dollars for them. They are useful to use if you want to just take a camera and lens somewhere without a bag, but have a little protection. You can actually have it on a camera with a sling that attaches to the tripod mount. Or useful to store a camera and lens in a cabinet and keep dust away. I'm not promoting that case in the link, it's just first one I found on ebay.