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I don't know if you want to go cheap but here's an idea. A cheap laptop satchel I found recently at Ikea for $9.99. Approximate dimensions 14"W x 10.5"H x 3.5"D. It's lightly padded all around and ballistic nylon material and comes with two padded pouches that can fit a typical RF. The second picture is the interior with a Domke F803 insert. I may add some padding at the bottom for added cushion and there's no grab handle.