SONGMICS6 Large Cube Storage Organizer, Plastic Interlocking Storage Unit, with Tall Feet and Rubber Mallet, 14.6 x 13 x 13 Inch Cubes, for Bedroom Living Room, White ULPC206W01

Q: Would my 16 pound cat break these if he sat on them?

Yes. It's made of a thin rubberized plastic & not sturdy enough for your cat either to jump on or sit on. It would topple over.

Q: It's it study enough to hold gaming systems such as Xbox and PS4?

No its junk..it will fall over...they give you these crappy straps to use plastic anchors to screw up your wall to hold this very unsteady piece of do do..

Q: What are the dimensions of the package it comes in? I want to pack in my land luggage and take it with me

Here are dimensions of the package: 15.16"X 13.19"X 4.53". Hope it helps. Wuppessen customer service

Q: How much weight can each "cube" support? Can I put books in the cubes?

No....I'm currently supporting toilet paper sponges one bottle of lotion..and a 7 lb air cleaner in my bathroom...I have another cabinet keeping it from toppling over...ITS JUNK