This fine black cloth, soft as silk, is folded up to the dimensions of a handkerchief. It unfolds into a circular sheet 6 feet in diameter.
You can take a Magic action to unfold a Portable Hole and place it on or against a solid surface, whereupon the Portable Hole creates an extradimensional hole 10 feet deep. The cylindrical space within the hole exists on a different plane of existence, so it can’t be used to create open passages. Any creature inside an open Portable Hole can exit the hole by climbing out of it.
You can take a Magic action to close a Portable Hole by taking hold of the edges of the cloth and folding it up. Folding the cloth closes the hole, and any creatures or objects within remain in the extradimensional space. No matter what’s in it, the hole weighs next to nothing.
If the hole is folded up, a creature within the hole’s extradimensional space can take an action to make a DC 10 Strength (Athletics) check. On a successful check, the creature forces its way out and appears within 5 feet of the Portable Hole. A closed Portable Hole holds enough air for 1 hour of breathing, divided by the number of breathing creatures inside.
Placing a Portable Hole inside an extradimensional space created by a Bag of Holding, Heward’s 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 and not behind Total Cover 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.
Math: here's a little I did in anticipation of my party's first probable use (tapestries and then extra stuff). It may be helpful if you're storing stuff that can fit in squares/cubes and are interested in space that takes. Please lemme know of any mistakes or additional useful info (especially from the 5 pages of comments on 2014), thanks!
Dimensions: 6' diameter hole , 10' deep.
Basics: total over 282 cubic feet or just over 8000 liters of empty space (from google)
PUTTING CUBES INSIDE:
given A hole/circle of 6' diameter, the largest square that will fit inside is 4.24 feet.
The area of the space left after that square is inscribed in the circle is approximate 9.27 square feet.
.(got the above 2 from googling largest square in a circle, and space left after square inside a circle)
P.s. I'm anticipating the first thing to go in will be tapestries. Which of course means my party will first put in something I'm totally unprepared for, like pillows or halfling skeletons (Next thing I have to research: is it possible to buy a cemetery and if so how many gp)
It looks like they upped the amount of breathable air from 10 minutes to 1 hour.
I always that that it was weird that a bag of holding and a portable hole had the same amount of air.
Hey, I notice unlike the Bag of Holding and Haversack referenced, the Portable Hole does not have the "Utilize" requirement in those items. Is that an oversight or is the hole different intentionally?
Is it holy
Maybe it takes longer than an action too use? Especially one person. 6 feet diameter and all. Unfolding and laying flat, smoothing out the edges, etc. I know i struggle unfolding a blanket and properly laying it on the bed (according to wife).