Which items I can put in standard backpack?

I can create Tool and then create sword from it.
It can be equipped, unequipped, activated, deactivated and hidden into backpack.
It is standard tool.

  1. Can I create just hidden tool (unused tool) something like part of something more?
    It can’t be setted to the bottom panel (1, 2, 3, 4, 5, 6, 7, 8, 9, 0) and can’t be equipped and activated but can be dropped
    If yes, how can I do this?

  2. Can I have more than one item in the same place?
    For example We have 5 crystals in the backpack (5 Tools)
    There is should be 1 icon(with number 5) instead 5 icons in the backpack
    If yes, how can I do this?

  3. Can I create a tool that can be activated but not equipped (something like healing) to use my hands for other things?
    If yes, how can I do this?

Tools cannot be hidden from the backpack since the CoreGui is hardcoded to display tools that are in a player’s backpack or equipped by their character. To create a selective hiding system, you’ll need to create your own backpack Gui that only shows and allows equipping for tools you specify.

The rest of your questions also have the same answer. You can make tool instances for tools for sure but any other behaviour (hiding tools, stacking them and unequippable abilities) need to be done from a custom backpack system. As for that last one, avoid tool instances - make your own ability system that activates when a key is pressed.

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