I've got a couple of
these that I like. Seem like they'd be big enough for a paperback. Get the leather straps on top and you could do a hardcover probably.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"