... 

I have not looked for a specific travel case, but unless you are being really rough with it I would say a padded envelope or a generic small case would do it. It's pretty sturdy. I take it to to the office sometimes and just put it in one of the pockets of my laptop case. Also, for extra protection against scratches I never removed the clear plastic film that comes over the screen. Except for the red ""pull here"" tab, you can't tell it's there. 

The rubber foot could not be took it off to replace the metal spikes 

I don't know the exact size but it even fits 12-13 year old kids. 

As long as the lense is 52mm it will work