Fix Elytra Meta and Inventory Problems

Minecraft to me has two main things that I feel need to be addressed and I know others have the same issues as I do. One being elytras, they are a very cool and fun part of the game but make other transportation kind of obsolete. The other issue that the community brings up lots is inventory management. I think my idea could solve or help both issues at the same time.

I feel like a backpack would be a perfect solution for both, so this backpack could work in multiple ways and have variations. Firstly I would say the backpack should go in your chestpeice slot, this forces the player to chose between storage, protection or movment. You could have it be a simple 15 extra slots, or maybe a 15 slots for just shulker boxes, could add enchants or different backpack varients (copper chest backpack, vs chest backpack that allow for more storage, or shulker access without placing down the box, pickup range increasement...