This is an excellent little case, as small as it could be and made to a high standard. My Ixus 40 fits very nicely inside and i now feel confident to take it out and about safe in the knowledge that it is well protected. It is a pity that there is no where for a spare memory card, but they are so small you could keep it in ur pocket instead. I was surprised by the review that said it was too large for the Ixus 55 as the 55 is (to within a mm or so) the same size as my 40. I really can't see how this case could be any smaller. If you want a quality case for just the camera then this is it! If you want a case for a spare memory card and/or battery as well then you will certainly need a larger one.