As the title says. This is because some lategame tools (like Spectrum's Bedrock set) don't have durability, and therefore can't go into the pack. Plus, wrenches can't be damaged usually.

Also, potentially make a tag for extra items for the magic bag, to add things like Botania's staffs/rods, Requiem's Soul Vessels, and certain potions and potion like items that don't use the vanilla item.

Great suggestion! I'm not quickly finding an actual c:tools tag in use, so I assume you mean c:pickaxes, c:axes, etc?

I like the tag idea, enough that It'd probably be a good idea to introduce one tag per pack that items can be added to as needed. For example, the potions you mention would potentially be better suited to a tag for the Magicpack