I got a quote from SteelPony.

It's just an enthousiast who has a very small production line. The develop their product on the road. His wife is the seemstress who puts it all together.
They're working on 2L bottlepockets on the bags right now, I was told. A very nice feature.

Shipping to the Netherlands si $ AUD 110. Adding import taxes adds up a bit too much for my likings. (12% added to the price of the bags + shipping) + 19% VAT = about 350€. And time to ship was approx. 2 months.

For a lot less I can get the wolfmans expedition dry saddlebags, which will stay waterproof without a problem. With textile bags there's always some do's and don'ts. You have to buy the bottlepockets seperatly, but still is a lot cheaper.

Although I like the Steelponys the best, I'm thinking of going for the Wolfman. Less expensive and still very good.

Andystrapz is a definite nono to me. Too many bad reviews and experience you can find online:
YouTube - Andy Strapz Bag Tests