Easy way to stack up to 4 tanks in 1 inventory slot

- cut power to chemistry lab

- set crafting for multiple tanks and close the window

- turn power back on

You'll be able to collect 4 tanks as 1 item. They work perfectly fine for storage, you will also only consume 1 on use. They will split if you force moving just 1 item from the stack. Like tanks crafted one by one, these will never combine again. Overall there is no difference, just saved inventory space.

Also, chemistry lab is labeled as workbench?