Like Anna said, if you would go for gear you have way more variation for back length available. I love my new Deuter backpack which is an SL model. They make a lot of their more technical packs in a short back length version.
Something like this:
https://www.rei.com/product/88.....ack-womens
I also love my Tom Bihn Daylight backpack but it doesn't have any structure at all. You might have a look at the Synapse 19, if that's big enough for you:
https://www.tombihn.com/collec.....4038833927
A lot more office appropriate, especially in black. Of course you have to like the "classic schoolbag" look.