I'm trying to figure out how I should translate the 'capacity in litres' of luggage into kilograms. I have a 20L-capacity backpack and I want to buy a piece of luggage that'll help me utilize my free baggage allowance (30 kg) for my next trip.
I'm guessing 1 litre doesn't equal 1 kilogram, given it doesn't make much sense that some luggage advertises having a capacity of 100 litres.
How do you measure it?
Any help would be much appreciated :)