Lay the t-shirt flat. Use a small round plate to trace a half-circle shape around the neck of the tee. Carefully cut around the outside of the marking. Cut carefully, not choppy! This becomes the top of your tote bag.

Remove the sleeves by cutting outside the row of factory stitches. This forms the bag's handles.

Put the right sides of the shirt together by turning it inside out. Run pins along the bottom hem, securing the two parts together. This forms the bottom of the bag.

Sew two rows of stitches along the bottom hemline that you just pinned -- this is the bottom of the tote

Turn the bag back to the right sides facing out. You have a tote bag!