SuperPro Courier Medium pics:



The right front pocket has pen-holders sewn in.







A pair of Sidis, one track handlebar, one helmet, one saddle with seatpost and with room to spare.



As you can see, the strap attachment to the bag is identical left or right. This allows for left or right shoulder use.



And the support strap.



Don't bother with custom, a Baileys is all you need. If you want to check out the bag in person, pm me.