lichmaster
Hero
Yeah. RAW it works, but even if they're not sending them to another plane "they cast haste, then hop in my backpack for full cover" is the other option. Ofc one could then say "ok sounds like your equipment's all going to start taking damage from fireballs etc" but that's an antagonistic direction I'd rather avoid.
You do you, but I don't think you need to bother to track damage to the equipment, a fireball should simply damage whatever is in the AOE, and that IMO isn't an antagonistic direction (a backpack doesn't make people inside immune from a fireball!).