Looking for a slightly larger bottle than the one I currently use (500 ml), I opted for the latter. Not being used to the uncapped flasks, it is a little unsettling at first. Was afraid she flees but this is not the case. However, if we vigorously shaking a few drops escape (to monitor if one carries in a bag). It is relatively light with 80 grams for a capacity of 650 ml per 75 grams against my old 500 ml. The diameter is thin enough (about 65 mm) which allows it to adapt to all bottle cages.
Ultimately, I am satisfied with my gourd change especially since it is easy to clean with a brush. And above all it does not smell and does not have the plastic taste, which is nice. It remains for me to see how she gets older.