In the cryptocurrency space, the term Bag refers to the ( typically above-average) ownership of a particular cryptocurrency. Although there is no generally applicable threshold at which an investor’s cryptocurrency holdings become a bag, it is usually assumed that it must be a larger than average amount of a particular coin or token.
Exceptionally large holdings of a particular cryptocurrency are commonly referred to as heavy bags.
See also: Altcoin Trader, Cryptocurrency Faucet, Shilling.