How to make a transparent lunch box opaque

1. Use sunscreen: sunscreen is a substance that can make materials opaque. You can coat a layer of sunscreen on the inside and outside of the transparent lunch box. After applying a layer of sunscreen, the transparency of the lunch box will be reduced, thus achieving an opaque effect.

2. Use opaque stickers: buy some opaque stickers, cut them into appropriate sizes and stick them inside and outside the transparent lunch box, so that the lunch box can become opaque and you can choose your favorite colors and patterns.