Many have been requesting this and that's enderchests to KitPvP, why not add them? It could also be like 1 row which you can store your stuff, and you can upgrade your enderchest say with like 10k coins for another row, and another 10k coins for 3 rows. Though kit items shouldn't be able to get stored in the enderchests (for obvious reasons), only items from fishing, mystery drops, and those were obtained through command blocks (like keys)