What Is A Sippy Pal cup strap? The Sippy Pal, sippy cup strap is a safe, quick and easy way to secure your baby's bottle, sippy cup or baby accessory to the harness of any highchair, car seat, stroller, bike seat or shopping cart. Why we say "It's the one that works!" The SippyPal, sippy cup strap was invented to quickly and easily secure on a sippy cup or baby bottle without falling or slipping off.