You will need a scrap of paper & Stampin Up's Round Tab Punch. For my designer paper I used the Sale-a-Bration Welcome Neighbor paper pack.
Insert the paper as shown & punch 2 tabs next to each other. Depending on how close you punch them you can vary the size of your drink. Then use your paper cutter or scissors to cut straight across as shown.
Cut out a straw from the scrap paper & there you have it
p.s. Hold on to the tabs you punched I have another project you can use them on! Check back for that another day.