These saddle bags work well, but could use some minor improvements to make it better.
Once the bags have weight in them, it tends to slide to the back of the cart when being pulled -even with the center piece attached to the cart box handle with the Velcro sewn into the seat of the saddle bags.
I purchased some Velcro straps to attach the front of the seat cover to the seat to prevent it from shifting.
The cutout for the seat handle doesn’t exactly line up with the cart.
The non-insulated bag has a clip attachment rather than a zipper which prevents the outside pocket from being accessed when it is buckled closed. That outside pocket could do without the zipper or modified to be accessed when the bag is closed.
Having weight in one bag and not the other causes it to shift to one side.
The saddle bags make accessing the bags on the side of the cart impossible if you strap down the bottom of the saddle bags. This helps with the shifting, but makes the sides of the cart difficult to access. It would be nice to be able to attach the bottom of the saddle bags to the same point as the top of the bag. A second D ring on the seat cover would allow this.
Definitely the best option for expanding your cart storage, and could be perfect with the modifications mentioned above.