Originally Posted by Vintage_Cyclist

My Arkel big bag doesn't rattle at all. I think the key is the adjustment of the handlebar brackets. It they're perfectly centered on the bag slots, there can be a little play, for side to side jiggling. If they're a tad to outside of center, the connection with the bag slots will be tighter, as they bind against the outside edge of the slot to bracket interface. Seems to be working fine so far, with no effect on ease of removing/attaching the bag.