I just weigh it to 1001g and call it a Liter. I have 1L Scientific Storage Bottles and they are all within 0.5g (580ish grams usually) of each other. They have a 1L mark on them that is EXACT, and when I weigh out 1001g , it’s usually just a hair under the 1L mark. So I would guess 1L =980-1020g depending on how hot it is. But seriously we are all measuring by the gram, who sells 1ml carts? No one. Everyone sells half gram or full gram carts.
When people have ask me for a Liter, they usually mean a Kg. I dont want to correct them, cuz I want their moolah 
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