Originally Posted by
staehpj1
If you have canti brake bosses the cheap tiny front sun lite rack that was everywhere a few years ago makes a great way to carry a camera bag as a front bag. It is just big enough for a camera bag. They were available for about $12. They are less common now, but you can find one on ebay for under $10. I prefer it to a handlebar mount even for my bag that was designed as a handlebar bag. I didn't bother to attach the bag super securely. I just set the bag on the rack and used the shoulder strap to keep it in place. It was quick and easy to grab the bag and take it with me.
+1 on this, especially given how big your frame is. You've got a lot of room between bars and front wheel to work with, so it would be easy to rest the bag on a rack there and not have to worry about supporting it securely and maintaining rigid structure while it's hanging on the front of the bars. If you can improvise a decaleur type mount, that would make it really secure on the rack, but it's not necessary.