starbucks Venti (24 fl oz) Tropical Acrylic Cold Cup Straws, 3-Pack Customize your Venti Cold Cup with colorful, reusable straws in red, aqua, and yellow stripe. Featuring a ridge at the bottom that stays attached to your lid, these reusable straws fit all 24-fl oz Starbucks Cold Cups. Handwash only. Do not microwave.