There's now a portable pizza pouch in case you gotta eat a slice of 'za the run. It was made by Stupidiotic, a novelty store whose products include underpants for your hands, a bag of candy dicks, and luggage with a scooter on it.

It uses a triangular pizza-shaped design.
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With lanyard technology.
A true breakthrough in pizza technology.

Here's the product description:

No one should ever be without pizza. Sadly, (often tragically) pizza is not always available for immediate hand-to-mouth consumption. Prepare yourself. Keep and carry a backup slice with this specially designed Pizza Pouch. A durable zip-lock sealing neck-strap pie slice device. Always fresh and ready. BONUS: Just wearing this Pizza Pouch will instantly make you more popular and attractive. It’s a bold (and delicious) fashion statement. Portable pizza. The best invention since delivery. 

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Sources: First We Feast