Just a quick hack here that i use to get my routing cables out of the way. The main problem here is that entry level index shifters usually have cables right where you'd want to be putting your handlebar bag. If you jam your bag there, it'll be constantly stressing the cables and will probably result in breaking a cable as some point.

This hack, lets you get the cables out of the way and keep them protected without having to upgrade your shifters.

 Enjoy, Please excuse the windy audio ;)

Ortlieb Ultimate6 Handlbar Bag Strap

I made some straps for the Ortlieb Ultimate6 Handlbar Bag incase other people want to use them. Check it out!