I use a clear Skinomi skin on my HD because it was too slippery naked. To transport it I use this sleeve:
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
There is some "wiggle room" in the sleeve but it is large enough to take an HD with a cover on it, and the sleeve is inexpensive and good protection. Probably any sleeve made for the Apple iPad Mini will work for the h2o, but I guess we will all see for ourselves in a week or two.