For the Red Original deck bag:

These easy to use clips are designed to attach your deck bag to the D rings on your board for the securest way to carry your kit. 

For the cargo net:

A cargo net is also a great way to carry gear on the deck of your paddle board, keeping it secured in place, as well as providing a handy, water-repellent, zipped pocket to keep valuables in. As with the deck bag, you can fit the net by attaching the clips to the D ring cargo points on your SUP.