Aside from the two pivoting boxes in the rectangular hatch, there a two larger Plano boxes under the seat that hold a reasonable amount of tackle. Inside dims are 7" x 12" x 2" high with dividers.
Hobie has a web strap to secure them under the seat, but I added a 36" tether to each of these larger boxes "just to be sure I don't lose them overboard"
I have an additional nylon mesh bag with a nylon string tether, that fits under rectangular hatch, inside the hull.
The front storage hatch of the PA-14 is very generous or you can add a crate behind your seat as some guys do.
Overall, I have reduced the amount of tackle I carry on my PA-14 after seeing/keeping track of what I actually use.