Sometimes things just happen, like a broken net hoop, etc.. Might I suggest something that had never occurred to me until another musher friend of mine showed me, and that is using automobile hose clamps for holding things together. Hose clamps come in stainless steel and often they are used to patch up a broken sled in distance races such as the Iditarod, so you know they have got to be tough. These little gems can be kept in your glove box or gear box, along with a screwdriver or nut driver to tighten them with, and they easily gang together if you need something longer. if you break a net hoop, as I saw someone have happen yesterday, you can take something as simple as a branch of wood and use hose clamps to make a bridge between the two broken sections. I would opt to use two clamps on each end myself, and then wrap them with electrical, or duct tape, to keep your net from snagging in the edges, protrusions, or ends.
Speaking of nets, I am so inept at tying knots, it is a miracle that I can even tie my shoes. When you have to do a net repair, any sort of knot will do quite nicely if you put a drop of Super Glue on it and it only takes a minute or two for it to set-up, no slip, no coming undone, and I have had these repairs last for several seasons. I carry a tube of Super Glue with my gear along with some repair line, and a safety pin for when the glue hardens in the tube and won't come out, and put all in an old prescription bottle.