I have used a small but nicely made (Cordura) backpack (No brand name but says Chicago Bulls on the front) on the front rack as semi-permanent storage. The backpack straps had buckles so I separated them and the bottom 2 were used to tie the bottom of the backpack to the rack and the top 2 were used to tie around the center bolt of the stem. The back and bottom each have a stiffener panel from coropac. It was quite stable with light loads but used to shift around when heavier items like 2 1/2 gal milk cartons were placed in the backpack. So, I bolted the bottom stiffener panel to the rack using two 1/4" bolts, wide washers (fender washer) and lock nuts. The backpack is now rock solid. Of course, you cannot easily detach it but you could place a sutaible bag inside the backpack, e.g. a camera bag. I keep a tube, pump and bike tool at the bottom of the backpack. The front pocket holds my wallet, bike lock key with garage door opener and cellphone which I pull out when I leave the bike locked in a public place. I just found out that it is not waterproof.