I have found that most equipment is damaged or destroyed during transportation rather than through use. As I recently replaced the net bags on two of my net frames, I wanted to find a way to protect them.
After much searching I found these vinyl wreath bags on Amazon:
They will hold up to 18″ diameter nets with the handles attached and I believe you could zip them around 4 or 5 nets at the same time. I tie the handles together with a pair of ball bungees. They work very well and are inexpensive to boot! There are only a few left, and I’ve been unable to find anything this size elsewhere on the web, so order now if you want one.