I appreciate your frustration - it is an annoying and (in my opinion) unhygienic trend. Teats are where so much of the bacteria in bottles grow. Having milk swishing around in them when you go out or pre prepare your bottles never sat well with me. We use pigeon bottles and I found myself in the same predicament. I called Pigeon and explained the problem and they sent some seals to me in the mail and now I can store them properly. I would contact the company or Australian distributor and explain the issue and see if they have any solutions for you. I hope you find a solution.