OK you tight gits, here’s my take on a home made bar harness (ish). Basically I didn’t actually “make” anything, I just used off the shelf Halfords straps to form a strappy harness type thing. I’m selling it well aren’t I? So what you will need is, two Halfords cargo straps, a dry bag, a bike and that’s it. I’ll explain how to actually strap it all up along with the pictures as I’m sure it will make it easier to understand.
So, step 1, run the strap as shown, over the top of the handlebar, round the back to the fork crown.
Next run the strap under the fork crown and back up to the buckle, but don’t go through the grippy part of the buckle, but through the slot at the back.
This all forms the first “loop”, which, under tension, creates a kind of vertical bar which will stop the dry bag hitting the bike frame. Now you want to loop the loose end of the strap back around the handle bar and up to the “grippy” part of the buckle, this is the loop the bag will slot in to.
Now run through these steps again on the other side of the stem to form the second set of loops. Once you’ve got both straps in place, slide your dry bag in to the front loop and pull each strap tight. I tend to find doing this in stages is best, first tight enough just to hold the bag in place, then begin tightening each strap alternating between sides until you get something resembling this:
It’s not the quickest setup, obviously an off the shelf bar harness from WildCat or AlpKit would be easier to fit etc but it would cost you a few quid, this costs less than a tenner.
It’s not the best picture, but hopefully between the top view and side view you can see the straps holding the bag off the bike frame.