It completely depends on what those liters are full of. The weight will be different for different substances.
-- If they're empty, they weigh nothing. Zero, zip.
-- If they're full of air, they weigh something, but not a lot.
-- If they're full of water, they weigh roughly 249 pounds.
-- If they're full of stones, or gold, or lead, they can easily weigh a ton or more.
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13 Liters = 27.474 pints. Since the adage goes "A pint's a pound the world around", it would be 27.474 pounds.
How many pounds in 3 liters depends on the specific gravity of the substance. Three liters of water weighs about 6.6 pounds.