Packaged Portable Holes

Here is another installment of exTRAPaganza, our Thursday over-the-top trap series. 

I still like to work off the whole portable hole <-> bag of holding thing.

The PC’s find several cloths that look like portable holes, and detect like them, but don’t seem to work. In fact, they are covered with a substance that negates their effect. However, if exposed to extra-dimensional space, such as that found in a bag of holding, the coating evaporates, and they explode.