Aura strong conjuration
There is a drow symbol on the front of the satchel.
Rats seem strangely drawn to the satchel, and when given the choice will enter it. It is appropriately sized for a creature that is Tiny or smaller to enter it.
Investigation showed that entering the satchel teleports a creature into some sort of warehouse full of decaying items. On one occasion there was a drow with a broom who was maintaining the warehouse, but looked like he didn’t want to be there.