Minimizing tackle storage for kelp
 

I have recently been able to get back in to kayak fishing the kelp after a hiatus of several years. There is still a lot of fine tuning of gear and technique.
One of the issues I've been having is dealing with my normal tackle bag. I have a hard time twisting around to pull it from the milk crate behind my seat, so I have been keeping it between my legs. It's not a huge bag, but big enough to be annoying. So , I've been looking for a compact storage box that had some way of attaching a leash to it. Something in which I could keep all of my tackle essentials in near proximity without sacrificing comfort.
I thought it would be easy to find, but no such luck. I finally bought a 2 level, Plano box and added a leash.
It seems to have plenty of room for all I should need. The only thing I'm not too keen on is the latches on the box, so I figured I could twist tie it during launch and landing. Just to be safe.

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Is that case waterproof?

If it isn't ditch it and go get a waterproof one.

No, it's not. I'm not worried about it. At the end of the day, I can just wash it and it's contents with everything else.