I bought the Bitolithic Sleeve for my MacBook. It's perfect It is made from the same material as an STM Glove but rather than having a single zipper at the top so you have to stretch it over your MacBook it zips all the way around. Inside is velvet and it fits like a glove without being too tight. It's not too thick so won't add extra bulk inside your bag, but it's strong enough to provide excellent protection to your MacBook. For the price you get the sleeve, an additional zippered pouch big enough to carry a portable external hdd and a screen protector that covers the entire top of your MacBook. (Note: previously the screen protector fabric was too thick to close the lid over, this one is thinner and doesn't interfere with the lid closing at all). I'll post some pics later if you like. I highly recommend this sleeve.