Now sold by Planewear - Seattle SEATAC Airport

SwingingCup.com

Man using swinging cup holder

Meet your new traveling companion, a hands free gadget for your beverage.

With its adjustable straps, Swinging Cup attaches to almost anything with a handle, including your rolling suitcase, grocery cart, crafter bag, lawn mower, stroller...

Based on the principle of a pendulum, and centripetal force, it holds your lidded beverage without spilling while you travel, work, shop, and enjoy life.

Made from washable materials: neoprene, nylon, and velcro. 

Kit includes:

 seamless dual walled insulated metal tumbler, lid with sliding open/close tab, straight metal straw. bended metal straw and a handy dandy straw cleaning brush.