Hang In There - Bedside/Sofa pocket organizer by annie.com

Organize your room while saving space when you utilize these handy bedside/sofa/chair caddies in two sizes.
Tuck one between the mattress and box spring (or sofa/chair cushion and frame), and everything you need will be within reach.
Multiple fabric and mesh pockets hold magazines, books, tablets, water bottles, remotes, phones, chargers, and more. Loops on each side provide quick and easy access to eyeglasses or charger cords. Keep everything at your fingertips!
The pattern includes instructions for organizers in two sizes:
Small: 15-1/2in H x 12-1/2in W plus 17in tuck strip
Large: 13in H x 23-1/2in W plus 17in tuck strip