Penny Scallan - Sip, sip, hooray! Our Bamboo Sippy Cup is the perfect next step when weaning your baby off a bottle. Made from lightweight, eco-friendly and durable bamboo fibre, it has easy-grip side handles and a leakproof flip-top lid.The silicone straw is soft and gentle on little mouths and is weighted at the bottom so it stays in the liquid even when the cup is tilted.