flat tire

on the bike.
We all went on a bike ride, up the street to the bike trail. I couldn't figure out how Larry was coasting and I was pedalling my legs off. Duh! Back tire was FLAT!
Max and I rode home via the bike path and Larry walked up the nearest street, pushing my bike.
Need a new tube.
I used to always have a repair kit with me, not that I would know how to use it. Now I don't even own a spare tube.