Allow the drawer you put it on to store an infinite number of items. The upgrade's crafting recipe would obviously be very expensive.

I won't add an upgrade with a recipe, but I am considering a creative/infinity upgrade. Then you could MineTweak your own recipe with a cost you deem appropriate.

I've added a "Creative Storage Upgrade" in 1.7.10, which will give a drawer infinite (well, 2.17 billion) capacity. You'll have to invent your own suitable recipe via MineTweaker or similar.