This seems like something I could have solved long ago, but over the years, have never found a single solution that has worked well. Either I have overlooked the most basic thing ever, or there is a big gap in the market....
I have a Highfield dinghy that has two seats, some seat bags which I added, and a front v-berth like locker. I have not found a single place to put a cup holder anywhere in the boat.
The hanging bags have a single cup holder like stretch pocket on the front, but it is very difficult to get anything in or out of it. And there are only 2.
Are there products that you've come across, or smart engineering you've come up with, for something to hold a cup in your dinghy? Attached to the PVC somehow? The transom? Another seat bag that is better?
I don't like spilling my drinks all the time. To prevent this, I just drink faster, but for some reason, that results in more spilled drinks.