The Co-op is trialling the 70cl bottle for its own-brand Scotch whisky before expanding its use into own-label spirits.
The 298g bottle is designed to cut carbon emissions and minimise the amount of glass used in packaging .
The Co-op aims to switch 400,000 of its 70cl bottles to the lighter bottles, making glass savings of 20 tonnes per year, according to a spokesman.
Funding from the government's recycling initiative Waste & Resources Action Programme has helped develop the bottle, made by Rockware. WRAP project manager Nicola Jenkin said: "The design proves that it is possible for packaging to be resource-efficient ."