Is your feature request related to a problem? Please describe.
Using /give to give myself a backpack only allows me to get the default backpack with no upgrades

Describe the solution you'd like
Using /give (or a custom command) -- give the user the specified backpack with the specified upgrades.

Possible Examples of Command
/tb give @s travelersbackpack:dragon 1 DIAMOND
/give @s travelersbackpack:dragon{tier:5} 1

you can do that
/give @s travelersbackpack:dragon{Tier:4} 1

tier needs to be uppercase first letter

Edit: and the highest tier is 4 (netherite)