Vedro translates to "pail" or "bucket" in Russian, although it is also a colloquial term in Bulgaria for dekaliter. Thus, a Russian vedro is about 12.3 liters, while a this Bulgarian vedro is 10.0 liters. A vedro can also be recognized in terms of charki (the plural of charka), Russian for "cup" or "glass"; there are 100 charki per vedro. Also, a fair unit for those most familiar with the imperial system of measure, a vedro is 25 pints or 50 cups.
The vedro was used as the de facto standard in Russian for measuring and selling vodka until the late nineteenth century, when bottling was not yet common. I think this is a good indicator of the characteristic Russian "thirst" for vodka - buying in bulk.
Source:
Erofeyev, Victor. "The Russian God" The New Yorker. 16 December. 2002: 56-58, 59-63.