His fans call him "Money" for a reason.

While backstage during an appearance on ESPN's First Take on Monday, Floyd Mayweather Jr. flashed a backpack with $80,000 in cash stuffed in a Ziploc bag ... well, because wallets are too small for his kind of dough.

"I don't keep a wallet," Mayweather said in the footage below. "I keep money in a backpack."

He added: "So, today $80,000, but you've got to realize, we got the trick bag, too, because you may see that bag, you may go for that bag but then there may not be money in it. We move the money around."

This is just flossing on another level. 

See for yourself.

Sheesh! That backpack is like a mobile ATM.

And with Mayweather's earnings standing at a staggering $700 million over the course of his legendary 19-year boxing career, there's plenty more where that came from.

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