This is just a regular small box with lid, I will probably put powder detergent in it, it's not very small (see the sizes below) but not big for sure, you can put many things in it, it's a general purpose box so not designed for a dedicated use.

Model Sizes

150x150x150mm, it has 4mm walls so actual inside area is 142x142x142mm which is around ~2.86L.

Print Settings

I left most settings at default but you can play with them, the model on the images had a little more customized settings such as different top shell type and 3 wall count instead of 2 to make it a little stronger, it also had ironing for topmost surface.

Lid has normal type of supports since I think it's better for flat and big surfaces you can change it to tree type if you want.

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Anyone has an idea or suggestion you are more than welcome, I'm not a professional designer or at pro levels of 3d printing so let me know if you want to share something in the comments :)