When the iPad first came out, the cover options were pretty weak. The official Apple case was nice because it was thin and bent so you could prop up the screen. I usually make zipper cases for devices, but for the iPad it seemed preferable to have a case that could stay on while you're using it. I was inspired by the Gigabyte Roll Pad
that I use for my laptop to create this quilted case. It opens like a book to hold in one hand, or rolls open to prop up your iPad so you have a good viewing angle.
I tend to be a pretty reckless sewer, so I've factored in a lot of wiggle room. You could use more acrylic rods to thicken the roll and velcro is just one idea for the clasp. I've ripped out plenty of seams and redone them with no adverse affects on the final product. Have an iron on hand to keep things straight between steps.