Sippin' SMART EZ Flow Straw Sippy - Green Innobaby Sippin' SMART™ EZ Flow Sippy Cup Innobaby’s EZ Flow Straw Sippy was designed to make drinking easy in any position. The smart straw has a weighted stainless steel ball that follows the liquid in the cup to allow continuous flow, and... MSRP: Was: Now: $12.99 Add to Cart