I would buy the small sizes just to get the bottles! Have been looking for ages for a small squeezy bottle (about 30 ml) into which I can decant some Dove soap. I know it sounds really weird but I hate going somewhere and not having any soap, especially in bathroom / toilet. It actually quite upsets me. I had this small squeezy round bottle about 30ml with a flip cap and then I lost it Shame as I loved that bottle. 50 ml is too big.
Seems expensive for what it is, but might be what you're looking for.
http://www.lakeland.co.uk/23080/GoToob-Small-Travel-Bottle