Describe the bug
I crafted the Travelers Backpack. I go to equip {shift+R-click} the travelers backpack and it says in chat "Can't equip the backpack". I have no armor on, and an empty off/main hand.

To Reproduce
Steps to reproduce the behavior:

1. ...

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
Travelers Backpack Bugs2.zip

Required informations (please complete the following information):

• Mod version: [e.g. v1.17.1- 6.0.0]

Additional context
I have to manually put the backpack on, I can't open the inventory, but I can swap my tools.

is it fabric?