The best way I have done the tool bag to the handle bars is to use the plastic wire ties to secure the bag . One on each side of the riser so the bag cannot move back and forth and one around each riser so 4 altogether. Drilling 2 holes in backs for each tie. The wire ties are the tightest way I have found. Leather lace can also be used. Straps are a option but do not get as tight.