SodaStream Black Half Liter Multi-Use Carbonating Bottles (2 Pack)

The half liter bottle is a perfect size without having to possibly waste what might be left in a full liter bottle - the reason I purchased a soda stream was I was tired of liter bottles of seltzer going flat if not consumed in one setting. Even though the soda stream liter bottles retain the carbonation unlike commercial store-bought bottles, it is just nice to have a smaller quantity of carbonated water that the half liter provides.

I've owned a soda stream for years and the old bottles reach expiration. It's a little confusing finding compatible bottles for my model but after a few minutes, I ordered a new pair. I save so much money carbonating my own mixers that whatever the cost, it's still economical. One suggestion, while you're at it, get an inexpensive pair of replacement caps. After a couple of years, the seal in the cap will eventually form a groove and not seat properly and you'll slowly lose carbonation.