This one is particularly funny to me since I am the only player in my group that meticulously denotes not only what I have, but where I have it. From the container to the placement of that container. I tend to play liars and sneaky dudes a lot so I have all kinds of hidden compartments in my clothing and even my tools to stash things.
Placing a portable hole inside an extradimensional space created by a bag of holding, handy haversack, or similar item instantly destroys both items and opens a gate to the Astral Plane. The gate originates where the one item was placed inside the other. Any creature within 10 feet of the gate is sucked through it and deposited in a random location on the Astral Plane. The gate then closes. The gate is one-way only and can't be reopened
As soon as your DM found that out you should have been vaporized. Putting a portable hole inside another extra-dimensional container causes a very large and deadly boom.