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I mostly use 1.5ml tubes but larger ones are available (5 and 10 ml I think).
I have a large stock of these tubes I got a long time ago. They are only semi-transparent and you have to take the specimen out of the tube to see it well enough to do anything with it although the labels are clearly visible (from time to time I have been sent clearer vials so they are available somewhere but I still think that they arn't clear enough to get a good view of whats inside
I usually keep just 1-5 specimens inside each tube but sometimes as many as 50:- it can be a good way to keep bulk material in a collection.

cheers
Adrian