One of the BEST bottle designs I have ever seen is the PET plastic SQUARE bottles which one finds for certain juices. These usually hold an actual (filled to the rim) volume of about 480 mL. Other bottles are available, as well. "Sutter Home" is a brand for a wine which comes in 200 mL PET bottles. Also, there are many 50 mL bottles for liquors which serve the purpose, as well. Living in Philadelphia, along with the incessant litterbugs, affords me an easy hunting ground for such searches.
I get ALL my bottles from garbage pails or on the street. Thankfully, most have the caps on. I then wash thoroughly, shake hard, then dry (usually overnight if turned upside down, leaving an airspace), then use them for storing either liquid chemicals or powdered chemicals. These are a godsend, in that they are light, do not break, and are virtually air-tight. - David Lyga