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I've used an Ortlied handlebar bag which, despite a few differences in size, looks like it mounts the same and sits in roughly the same position as this one. I found it a bit of a pain, it placed a load of weight quite high up which was quite fatiguing on the arms after a while.
If you just want space for luggage, that isn't so easily accessible then I'd consider simply and Alpkit dry bag, hanging of the handlebars. The issue is where it rests, ie, if you have sturdy mudguards then that's fine and I added a seperate section of cable housing to cover where it sat against the brake cable from the canti brakes. I found this to be a pretty much perfect way of carrying things out the way and with minimal issues on the handling of the bike.
Not a conclusive answer, but something to consider.
I'm going to grab a bigxtop rando bar bag for an bike tour down to Spain. I'll be using my road bike, which I think has 42cm bars from memory.
Anything I should be aware of or is there a better choice for the money?
Cheers
http://www.bigxtop.com/collections/all/products/rando-bar-bag