I've always felt that coffee sleeves were a bandage for a poorly designed cup. Years ago Starbucks cut back on their wood-fiber content of their cups to cut their weight and save money on shipping costs. It worked! Sadly the result was that the cups were less insulated and made the scorching of our hands worse when ordering a cup of joe. Enter the coffee sleeve. Saves your hand but uses MORE wood-fiber. Hence my belief about how they are the product of just poor design. Ever since I had this realization I've used reusable mugs for my morning coffee and found ways to polemic pieces (mainly furniture) that reuses these paperboard bandages.
A few years ago I had the idea of creating a coffee table completely out of coffee sleeves. It took me a while to figure out the legs and after countless sketching and experiments they all failed. Last year I ordered a toy bin for my daughter and it came nestled n these beautiful cardboard cushions. Instant legs! I made a compromise in terms of a coffee table made of 100% coffee sleeves and created this table which I call "Caffeinated Table". I will be adding a glass top, however even with corrugated top, your mug of coffee is fairly stable.