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Perhaps the gas does leave the bottles, but I'm certain it also leaves via the lids. I've never used PET bottles, but have extensively used glass bottles with PET lids. Saxby's Ginger Beer Bottles are ideal for this. I've found that after 12-18 months more and more of these have low or no gas levels. After about 2 years I'm lucky to have any carbonation left. I still use these bottles, but only for short turnaround brews.peas_and_corn said:It isn't the lids that degas, pet isn't impermeable for co2 so it actually leaves via the bottle itself (albeit very slowly)