“lighter than the Platy 2.0L”

Answer

Bottles & reservoirs lighter than the Platypus Platy 2.0L Bottle

Every one lighter on maker-published weight · closest in list price to the Platy 2.0L Bottle first · about 0 L

Nothing on record is lighter than the Platypus Platy 2.0L Bottle among bottles & reservoirs (about 0 L).

11 left out of this comparison: 7 with no published volume, 4 with no published weight.