I think of bitcoin as THE null commodity.
No intrinsic use. No mass. No degradation. Transports at the speed of light. Perfectly scarce and not debaseable.
All other commodities exist at various vectors outside of this null point. They have various usefulness in and of themselves. They have mass and volume. They degrade at different rates. They take a lot of time and energy to transport. They aren't perfectly scarce and some are absurdly abundant.
Humans have overloaded various commodities throughout history with the memetic concept of "moneyness". Mostly gold and other precious metals because they have properties close to the null point that we find most important (primarily scarcity and close to zero degradation). We hoard these non null commodities because we came to collective consensus to imbue them as the database of our debt to each other, otherwise known as money. However, this had the negative effect of tying up otherwise useful commodities that we might have been able to put to productive work. This money also had the negative effect of being difficult to transport, store securely, and fractionalize.
Then came government backed, faith based currency. It's a near null point commodity and we really like that when choosing something to imbue our collective moneyness concept in. No intrinsic use. Low mass (paper) to no mass (digital). Limited degradation (paper with replacement service) to no degradation (digital). Easy transport (paper with high denominations) to light speed transport (digital). However, it's scarcity is highly questionable. To quote Satoshi, "The central bank must be trusted not to debase the currency, but the history of fiat currencies is full of breaches of that trust."
Bitcoin is the null commodity because it solved the final piece of the puzzle that we tried to solve with fiat currencies. Eliminating trust in central authorities and perfect scarcity.