@aa It's interesting that you happened to post this right now. First of all, it's a cool concept on its own. I had been thinking how much I would like a Jefferson-style notebook where the back cover extends out and folds over the front cover and contains a sleeve similar to this (for receipts, etc.)
@aa Also re: the Jefferson, I was trying to envision a different closing method that doesn't involve the "belt" -- the magnets are interesting, especially if incorporated into an extended "flap."
@dvdlite Absolutely, both modifications are possible: where there's a back flap that can be used for storing receipts and the like, and where that back flap is used to contain the other half of the snap-magnets for closing the case. You can send me an email and we can pickup the back and forth there: Aaron at amaiken dot com