No expert but I suspect there is tolerance - after all you get riders of all shapes sizes and weights. Plus when cycling, different pressures and percentage of body weight resting on the bars fluctuates as you ride. A light bag with some coats snacks gloves keys phone what have you, probably wouldn't affect the future shock tolerances too badly. If in use and you notice the suspension is less effective, less dampening & if you end up using a handlebar bag regularly you could always swap out the compression to a firmer one. That's maybe what that "Compatible with Future Shock systems" might allude to.Interesting!