Anyone know if there is a zip case that will fit around an iPad with the Otterbox Commuter case on it? I like the commuter, but would also like something to cover the whole iPad when travelling? I want to make sure whatever I order fits... The commuter does add a bit of bulk. Looking for something similar to this... http://www.powersupportusa.com/catalog/product/view/id/339/s/eco-zip/category/37/ Thanks.