In classic, cobblestone was heavy/very small, and fit inside small vessels:

In TNG, cobblestone does not fit in small vessels, and is also heavy/very small.

Meta Info

• TFC Version: build 94

Vessels are limited by size: < Large and < Heavy. We currently default to very small / heavy for ItemBlocks. To keep the same stack size, this would need to change to Small / Normal, here:

Any anywhere else that value is hardcoded. Would also need to investigate possible side effects caused by this change (likely none, but possible interaction with other size limited containers)

It does seem strange to me that 4 Light/Tiny rocks can make a Heavy/V.Small cobble block, so Small/Normal makes sense for cobble blocks and maybe raw blocks.

So this was broken in #519 to make the size annotations match Classic. I think the right answer is Medium/Small to match the 32 stack size of Classic while also allowing carrying them in small vessels.