Excerpt: Like all Canon pouches, this one protects whatever you put in it from getting scratched up without adding weight or bulk to your camera bag. I believe this is Canon's smallest. It comes with Canon's extenders, but it is also useful for other small items that need a case like extension tubes and the 40mm f2.8 lens. When those items are in use the pouch also serves as a good place to put your lens caps so they don't get lost.
Excerpt: I wish someone would come up with a better solution than these little drawstring bags and this is a great one too. Well padded and everything but the last thing I want to do when I need a lens is spend more than 3 seconds pulling a lens out of a bag.
Pros: Comfortable, Lightweight, Strong Construction, Well Padded
Excerpt: I bought a 50mm F/1.4 lens but to my surprise it didn't come with a case. This was my first non L series lens that I've bought but still wanted to take care of it. I looked around on eBay and other places but didn't want a funky over sized case. I had recently purchased a Canon Extender EF 2x lens and since it is an L series lens it came with this case. I looked around and most places told me that I couldn't buy one from Canon.
Pros: Easily Accessible Equipment, Strong Construction, Well Padded