Here is one of the tabs. It seemed like a good idea, but getting the biding round the corner was very tricky, and it limits the opening to the bag. Plus, one side is bigger than the other, and one has a tuck in it!
I suppose it doesn't look too bad (you can see the tabs have more room on one side than the other, here!) but I think I'll have to go back to the drawing board on this one. Unpicking is never my first port of call, but this time it'll have to happen!