SodaStream bottles.
Pay Attention To Your SodaStream's Expiration Date

Your reusable SodaStream bottles do not last indefinitely. The bottles last up to three or four years, but you should probably stop using them in carbonation machines beyond that.

Over time, the structural integrity of your SodaStream bottles may weaken due to fissures, cracks, scratches, and general wear and tear.

Using a bottle before its expiration date can help "to reduce the risk of bottle failure[,] which can result in personal injury and property damage," according to the product manual.

One TikTok user, @jess_einaudi, surmised that "bottle failure" refers to bottle explosions, as the compromised bottles can no longer withstand the pressure from carbonation.