1. The primary function of a wallet is to hold money. Whether it's large bills up to 100 yuan or small bills down to the last cent, it's much better to organize them by category than to just mix them up. This makes both storage and use more convenient. I think this is self-evident.

2. In the information age, various cards have emerged, and transportation cards, meal cards, bank cards, and attendance cards are essential. Some people also carry other cards, which are better kept in their wallets (at least they are less likely to be broken or demagnetized).

3. Put some important things that can be taken out at any time for spiritual enjoyment. For example: the beautiful image of your lover, the handsome photos of little emperors and princesses .....

4. A wallet is an external manifestation of one's personality and a reflection of one's identity. If one flips open their wallet and finds their money and miscellaneous items scattered inside, it at least reflects that this person is not particular about trifles. Moreover, nowadays, a thousand-yuan bill in a wallet is not the most luxurious, so some people treat it as a display of their status and are very particular about it.