Hello, A friend recently introduced me to a beverage called Pomx Antioxidant Super Tea, and the bottles are absolutely great for chemical storage. The "tea" itself is pretty good once you get used to it, but can taste a little odd at first (slightly pungent, slightly bitter, but still sweet, with some odd flavor mixtures). The bottles are clear PETE plastic, but the plastic is much thicker than a water bottle. It is nice and sturdy. The bottom makes the bottle stand much more stably than a water bottle as well. A nice continuous rim at the edge of the bottle and the thick plastic make these bottles anything but wobbly. The cap appears to have a great gasket. Seems to be a somewhat elastic, but not soft plastic. Should keep air out perfectly. The bottles are labeled 8 fl oz (473 ml), but they will fit about 494 ml when filled all the way to the top. So, they are, for all photographic intents and purposes, close enough to a half liter bottle to be called one. The shape of the bottles is simple and clean. Straight sides, domed top. No frills or weird space-age moldings like water bottles. The spout is nice and wide (over 1 inch diameter), so they pour and funnel easily and smoothly. I don't know if there are any other sizes available, but I will certainly be buying this tea for a while in order to stock up!