Thanks Louise. Yes, it is inconvenient to carry ceramic mugs everywhere. Surprisingly while trying to further refine the idea, I found a couple of similar ideas executed. Both the products use sillicone material for the cups which can be reused multiple times. http://www.dailymail.co.uk/sciencetech/article-2688704/Now-thats-flat-white-Reusable-coffee-cup-collapses-youve-finished-drink-fit-pocket.html https://makearchitecture.files.wordpress.com/2010/03/inspiration.jpg
Yes, having collectibles like stickers or fridge magnets might extend the life of lids and enhance the user experience.