I have had my Grayl
I have had my Grayl Transport Sling now for around 3 weeks and have worn it on my daily walks. It easily fits a 1L Yeti flask, my mobile phone and keys keeping my pockets free which I like. If you want an easy grab and go bottle carrier then I can highly recommend it and appears to be well made.
Checkout and shipping were all simple and my bottle arrived ahead of the predicted delivery date.