We used this on a big trip to Disney World and we loved it. The harness system worked perfectly and was able to adjust to fit my chunky 19 month old (30 lbs). I loved that I could put small things in his backpack (I eventually put enough equipment in there for one diaper change and restocked it after each change) and it helped us not have to dig through the diaper bag as much for the things he needed. I would absolutely recommend this. I also love that the clip that tethers me to the backpack is on the bottom of the backpack. My son did not seem to mind that this was on him (we also tried it out before going on our trip so he could get used to it). I can not sing enough praises for this.