Perhaps the low amount in SP is from that seal in the bottle cap?
Iirc their bottle is a thick stiff bottle type, of the same type that my favorite bottled mineral water Ramlösa uses.
Maybe someone could confirm this.
Whenever I see bottled water in american TV it's always that cheap wrinkly bottle. That type is always cheaper here in Sweden.
Depending on where you get it, the difference between a cheap wrinkly soft plastic bottle and a thick stiff plastic bottle of water can be 100%. From 10kr to 20kr.
Edit: Was an italian brand until Nestlé bought it, it seems.
I've always been curious about plastic milk containers vs Tetra Paks as well. Beyond bottled water there are so many other liquids consumed out of plastics I feel as though there aren't many alternative options that wouldn't impede the cost of shipping (aluminum/glass) that consumers would be willing to pay for.
I thought the transition to thin plastic was partly due to increase crushability of the bottles and to reduce plastic use. Though that can also be considered as marketing speak.