Hi all, I am taking a 10 day plane, train, and car trip through multiple countries next month and have been researching cases a great deal. I am considering all the types and styles but was wondering what others use for travel? I want to have it for down time while traveling. I was considering the otterbox and a back pack but it may be too bulky. I like the Timbuk2 messenger as an option and have searched extensively here about the bag and opinions (size etc). I also thought a portfolio may work as it protects both sides should the ipad slide down in a bag or get moved around during transit. Thanks for looking.