You'll flipping love this lid! Just slide the button and the mouthpiece will flip up for easy, touch-free, one-handed hydration. Designed with NEW extra durable material and a soft-feel silicone mouthpiece, these Flip Straw Lids are flipping fantastic. Flip Straw Lid These lid hulls can be mixed and matched with your existing frank green lids. Flip straw Lid pack includes flip lid hull and strap, straw not included.