Some questions about mongodb’s data structure, big brother, please come in!

  mongodb, question

First contact with nosql
There are some doubts about the table structure.
For example, design a game user list
Should the user’s backpack be included in the user’s table or built separately?

//user table user
 {
 _id: '',
 name: '',
 email: '',
 ....
 backpack: [
 {
 //backpack 1
 },
 {
 //backpack 2
 }
 ]
 }
 //or
 //user table user
 {
 _id: '',
 name: '',
 email: '',
 ...
 }
 
 //User Backpack Table
 {
 _id: '',
 user_id: '',
 ...
 }

Solve! Thank you!

This is a simple data problem, involving the database.
Personal suggestion is to establish separately and restrict association through foreign keys.