Modern fishing kayaks are built with internal hatches, but if your kayak is bare bones old school and doesn’t have one, you might have been using an old milk crate. This is sad.
Take it a step up and get a glorified milk crate on steroids: the BlackPak by Yak Attack! It's a great place to put all sorts of gear including tackle boxes, bait pumps, PFDs, fish measuring devices, fish grips, bug spray, ThermaCELL, sunscreen, and dry bags.
This 12"X16"X11" crate system has 10 stations for rod holders which can be mounted at a variety of angles for a total of 50 possible positions. The top rails are designed to accept MightyBolt accessories, eliminating the need for GearTracs or Mighty Mounts to attach your VISICarbon Pro, PanFish, or other MightyBolt compatible accessories. Includes lid and three rod holders, carry handles, drain holes and E-slots, and shock cord rigging that's factory installed across most kayak tankwells.