The plastic zippers on this SUP board bag had broken and become unusable. We replaced the plastic zipper sliders with medal sliders that will last longer.
The best way to keep your sup bag zipper in good shape is to avoid using force on the zipper. The tip and tail corners are common areas that see force damage. If you have to pull hard on the zipper, back up and go easier. Get it in line and ease the zipper past the tough turns. Try not to step on the zippers when loading or unloading. Zip the entire zipper open too. Dont fold the top back when the zipper is not at the ends. Keep out of direct sunlight, especially on hot days. Finally, wash the bag out with a garden hose from time to time to keep sand and debris out of the zipper. Enjoy the paddle!