The space-time continuum must earn my respect!
The Portable Hole™ Extradimensional Doorway is a flexible, foldable opening into an extradimensional area. Portable Hole™ is the owner and maintainer of UnSpace®, a set of extradimensional spaces (in a variety of [extra] dimensions!) in a secret location really really far away from any inhabited star systems, to reduce the likelihood of a mishap. Portable Hole™ walls are fashioned of the very fabric of space-time, and are thus unbreakable, yet remarkably flexible! Portable Hole™ and UnSpace® are fully insured against breakage (which is of course impossible) and leakage (which is infinitessimally rare) so you and your possessions are safe inside.
Caution: Do not allow your Portable Hole™ Extradimensional Doorway to be moved while you are inside it, unless you have a self-contained source of breathable air. UnSpace® contains no air other than that which enters it while open.
Safe when used as directed.
Get yours today!