What about that pouch on Batman’s utility belt in “Superfriends”?
That’s why he was always prepared.
Wherever it is (pockets?) that you put most of the stuff you carry (but do not wear or “have equipped”) in Skyrim (and similar computer games in which you can accumulate a large inventory). Where your follower carries stuff too, and cupboards, satchels etc. in Skyrim (but not, for some reason, bookcases).
The Wardrobe in The Lion, the Witch, and the Wardrobe.
The Total Perspective Vortex in Adams’ The Restaurant at the End of the Universe.
Oh! And from Adams’ The Hitchhiker’s Guide to the Galaxy, the planet Magrathea.
Kim Kardashian’s vagina?
Did anyone mention virtually any clothing that Bugs Bunny would wear?
Sung by Paul Peterson who played Jeff on the Donna Reed Show.
I just saw the Simpsons rerun that features What’s in Krusty’s Pocket? Great bit.
The Cabinet of Curiousity was featured in Making Money. It has an infinite number of 14" drawers. Anything removed from a drawer has to be returned within 14 hours.
A later poster indicates this is part of Hex. The Cabinet predates Hex, but Ponder Stibbons has found a way to use Hex to catalog and control the Cabinet, which may be part of the confusion.
The Jupiter Two in Lost in Space. From the outside, it was maybe big (tall) enough for one story; inside, it was two stories and had room for the Crawler and the lander, which were two stories tall.
Not sure if it counts as “pop culture” but Harry has something in “Harry Potter and the Methods of Rationality” that’s bigger on the inside. A suitcase, I think.
On * Phineas and Feb: Mission Marvel*, the crossover with Marvel Comics, the brothers show Iron Man, Spider-Man, Thor and Hulk their Secret Hideout for Emergency Defense (SHED) which looks like . . . a shed. Until you go inside. Then it looks like a Stark Industries lab. Ferb (a Brit) claims it’s “just a little British sci-fi technology.”
I’m glad SOMEBODY else mentions “LiS.” I don’t feel like such a goon. Hold on to your hat: in the 3rd season episode, “The Space Creature,” (spare no expense on titles) the “climax” occurred on the THIRD level–the Power Core (actually their engine room)–they had to take a ladder down 15 feet to get there!
Supposedly the Chariot disassembled for storage but you still had to stow it somewhere, but you’re right–there’s no getting around that Space Pod being so large.
And if you’re trying to tell me Irwin Allen was employing Hammerspace, well now you’re just being silly. 
It’s Irwin Allen. He was employing Minnowspace.
The Spice Bus in Spice World.
The Force
Lightsabers
The Millennium Falcon
Indian Jones’ whip and hat
Doc Brown’s DeLorean
The One Ring
Dave’s eyeball in 2001: A Space Odyssey.
One of my Land of the Lost fanwanks is that all the Pylons shared the same interior, which was the same size as the LotL- they were the “inside” and “outside” surfaces of a hypersphere. That presumably you could go from one Pylon to another if you wanted to walk in the dark far enough (or WAS there anything else in there?!?)
As I recall the Keeper’s telepathic staff only worked on animals, children, and the incredibly weak-willed and immature Dr. Smith. The Keeper was one of those “so advanced as to consider humans merely clever animals” aliens, until by saving the Keeper’s life the Robinson’s demonstrated moral compunction, which convinced him they were “people” after all.
Or Hermione’s purse in the final book.
Daddypants, did you get this mixed up with another thread? I can’t see how any of those qualify.
Maybe he didn’t read the full title of the thread?
Back to Men in Black. The farmer’s “suit” holding the Bug. Also the locker with miniture world and minions.