Code a new item in a plugin?

I wanted to ask if it is possible to create a new item in a Minecraft plugin. For example, a backpack that you can use. The backpack should have its own texture. I just wanted to ask if this is possible and how it works.

Dane for answers.

The problem is that you can only influence the server with plugins.

You can therefore not make things appear to the player that do not exist in the normal game (e.g. New items)

But you can change how the world behaves around the player by rearranging normal festures.

You can create a texturepack for it and if the item has a certain name it looks like a backpack. This video explains how to do it:

https://web.archive.org/web/2oe_/http://wayback-fakeurl.archive.org/yt/3OeNc2-o0ek

(Don't worry about the "fakeurl" xD)

You can change something like a jigsaw block in a texture pack

(is such a block that nobody knows and that nobody uses xD)