Bag is crypto slang for the coins or tokens a trader is sitting on, and how the word is used depends heavily on tone: it can be a neutral shorthand for a position, a boastful nod to conviction, or a wry admission of a loss nobody wants to talk about.
The term migrated into crypto from decades-old stock market slang. "Bagholder" combines "shareholder" with the older English idiom "left holding the bag," meaning someone stuck with the consequences after everyone else has cashed out or fled. Some etymologies also trace it to Great Depression breadlines, where people clutched bags containing all they had left. Market commentator Joseph Granville helped popularize "bagholder" on Wall Street in the late 1970s, and the phrase crossed over almost unchanged when crypto trading took off.
There is no fixed size that qualifies as a bag: it can describe a whale's multi-million-dollar Bitcoin holding or a retail trader's small stash of an obscure altcoin. What changes the meaning is price direction. A bag that is climbing gets called a "moon bag" and is a source of pride; a bag that has collapsed, especially after a rugpull or a failed project, turns its owner into a bag holder, clinging to the hope of a rebound rather than realizing the loss. Behavioral finance calls this reluctance the disposition effect: investors sell winners quickly but hold losers far too long, hoping to avoid locking in regret.