Aus dem FAQ von Urban Bottles, den Wert mal zwei rechnen gibt die 0,16 die auf den 1L-Flaschen stehen:
The number that is printed on all our Urban Bottles, namely 0.08 Kg (2.8 oz), indicates the amount of CO2 emitted in the production of one single disposable 500ml plastic bottle.
Therefore it is the quantity of CO2 you avoid releasing into the atmosphere every time you refill your Urban Bottle instead of buying a short-lived single use plastic bottle.