The Mickey Mouse design 160ml plastic bottle has been used for about six months. The 120ml glass bottle has been used for one month. The glass bottle is as good as new! As a bonus, I'll include a sponge for washing slim nipples. The nipple on the glass bottle is also very clean, so if you'd like an SS nipple, I can include it at no extra charge. I'd like to sell these as a set only. Thank you for looking.