Is your feature request related to a problem? Please describe.
There are some mods that add some healing items, I think a better implementation can be created that can also work with the Traveler Backpack.

Describe the solution you'd like
A dedicated backpack slot for storing a healing item (such as a thrown potion),
If your health is 2 hearts or less (4/20 health or less), the item will be applied automatically.

Describe alternatives you've considered
An additional or integration mod can be created where:
a healing potion, a sheet and a string can become a bandage which can be stacked (to 16),
4 bandages can become a basic medkit (white), which can heal you for 8 hearts (16/20 health) but cannot be stacked,
8 bandages can become a standard medkit (brown), which can heal you for 16 hearts (32/20 health *(some mods can have more than 10 hearts)) but cannot be stacked,
8 bandages and a potion can become a complete medkit (red), which heals 16 hearts (32/20 health) and with the effect of the potion but cannot be stacked.

Additional context
I try make some sprites, I think recipes must be easy to understand but balanced, could be fun have items that they can save your life and be an extra that this backpack can offer compared to other options.

Notes:
I make a fast design (original backpack up, table button down), you can put any potion (healing, regeneration or not healing).
With the hypothetical mod you can have more and better form to heal in emergency:
A bandage heal 2 hearts (4/20 health), same like healing potion, can be stacked anywhere but in the healing slot (only can have 1 here to balance).
A complete medkit (red) need 8 healing potions, 8 sheets, 8 strings and (example, a regenetation potion) to heal a lot of life in very hard situation.

The reason why I suggest this (a healing ranure and some healing stuff) is because I have not seen any mod on first aid and because it can be a great complement to a traveler's backpack who seeks to prepare for any situation.