I have loved Chillys bottles (the ORIGINALS) for years and when I saw the look of Series 2, and the description of the improvements, I decided to order one bottle and one coffee mug. What a disappointment!! The shape of the original bottle gives a smoother drinking experience than the new boxy shape. The sleeve around the neck of the bottle, which sounded great, just feels strange. The sleeve, anyway, very frequently twists off WITH the top, which it’s not meant to. And whilst the coffee cup Series 2 does not claim to be 100% leak proof, oh boy, is it NOT leak proof!! It leaks EVERYWHERE, ALL the time! The position of the teeny sip hole means it even leaks when drinking!!! The trouble is, of course, that you only find these things out ONCE you have used them, and once you have used them, you can’t return them! Result? An expensive mistake!! 😢 The new carry loop on the bottle IS good however, so ONE plus over the (cheaper!) original … just one!!