Okay, I have to admit - I was skeptical about needing a special cup holder for my bag, but now I can't imagine going to the beach or on road trips without this thing! It's basically this lilac-colored neoprene sleeve that attaches to your tote bag, beach bag, or even diaper bag using hook-and-loop strips. The main selling point? It securely holds my Stanley 40oz tumbler (and other similar-sized cups) without tipping over. The elastic material stretches to fit snugly around various cup sizes. What I love is that I no longer have to worry about my drink spilling all over my bag contents or having to hold it constantly. The insulation actually works pretty well too - my cold drinks stay colder longer. It comes in two styles (I got the plain lilac) and looks cute while being super functional. Installation takes seconds - just stick the strips to your bag and you're good to go. Now I can actually have both hands free while carrying my Stanley around. If you're a Stanley cup fan or just someone who always has a drink with them, this simple accessory makes life so much easier. No more drink spills in the car or at the beach!