I would have much preferred to get my hands on an example of the above Fuji film case from Japan Camera Hunter but Bellamy says these are not going to be back in stock again. He did mention the possibilty of him having some cases made and if that does happen I'll definitely be buying one or two. For now though I'll be making do with a Hama Film Safe that I found on eBay and got for an absolute bargain price. The Film Safe is meant to protect against X-Ray damage which I don't think the Fuji case does.
Sure it only holds four rolls of film but that's enough for a good day's shooting I think.
No why you should own a film case.
Of course there's the obvious like it'll keep your films clean and dry and in the case of the Film Safe at least, protected from X-Rays (although all evidence seems to sugest airport X-Ray machines shouldn't bother you unless you are travelling with film faster than iso800). A film case also makes finding your films in you bag easier than if you carry them loose.
But there's another reason, and in my opinion it's the best reason. Shooting more film. I'm a firm beleiver in having nice stuff because everyone enjoys using nice stuff and the more you enjoy using something, the more you will use it. I've wanted a film case ever since seeing them on Tokyo Camera Style and I'm pretty sure that now I have found one I'll be making a point of shooting with my film cameras more often so I have reason to fetch it out my bag and play with it.