Any particular reason not to simply get a glass fermentation jar? I try to minimize plastic use, and I swear things taste better out of glass.
since there is so much sugar available in ginger beer, fermenting/carbonating it in sealed glass bottles will result in bottle bombs.
skip the fermentation completely: 2 liter plastic soda bottles are great for force-carbonating with a co2 tank. if you really don't like plastic you could find a 1 gallon stainless steel keg and carbonate (and serve) from that.
I also recommend, if anyone is interested, investigating “ginger beer plant” (GBP), which is a symbiotic culture of bacteria and yeasts (SCOBY) such as that used to brew kombucha and kefir. It was once common in Britain, but almost went extinct. Some was saved by a German culture bank (DSMZ), and now you can buy some online! Makes a different, and I think delicious, drink compared to the “ginger bug” method!