I'm pretty sure this used to exist - multiple shopping lists that you could store and check out?
For example - I've got 7 things in my cart for a future project coming up...but I need to buy something else right now. I can't just move those 7 items to another shopping list and check out with the 8th item that I need to buy today...I need to wipe my cart of those items, and only then can I check out with the 8th item.
I don't want to write all these things down
It'd be a lot easier to make a shopping list on the website and pin all those parts into that one...