It's easy to carry reading glasses just about everyplace you go.
ThinOPTICS are the thinnest, lightest and most durable reading glasses in the world. And there are three ways to get them so you'll always have them with you. You can buy the ThinOPTICS glasses alone for about $20. Or in a universal pod for about $25. Just attach the Universal Pod case to the back of your existing phone, phone case, e-reader, tablet, laptop or slide them in your wallet, purse, or make-up kit. Or you can buy them as part of a smart case for later versions of the iPhone 5 & 6 and the Galaxy 5 for about $40. ThinOPTICS free you from having to remember to carry your reading glasses everywhere no matter how you choose to carry them. And the company says they're very rugged. Constructed with ultra-flexible titanium alloy bridge made from Nitinol (10x more elastic than spring steel). Lenses are shatter-proof polycarbonate. Frames weigh less than a nickel, and are about as thick. 3 strengths available,1.50, 2.00, 2.50. Their website says they'll replace broken glasses for free (probably just pay shipping) and there's a 'torture test' video here to show how rugged the ThinOPTICS are: https://vimeo.com/76780114?autoplay=1
Here's a link to many styles at Amazon: ThinOPTICS
Company website: http://www.thinoptics.com/