Do you plan on swimming or being on fire?
.
You guys carry bullets?
Why not carry exactly what you need? "Today, I plan on shooting 20 people so I will bring 20 rounds!"
Yes. I also carry primers, brass, and gun powder, all packaged together.
I wonder if the people who think they will never need an additional magazine have ever seen the floorplate on a magazine fail and dump all the rounds on the ground. I've seen it several times and once was when it happened to me. The most common is Glocks, especially with the Glock or similar +2 floorplates. In fact, I saw it happen in July at a match with a Glock.
I would be very sad if I were in a tense social situation requiring the use of a firearm and then my one and only magazine puked its contents onto the ground at my feet. Very sad indeed.
You stole my line.
That could possibly depend on where one is planning on going. St Louis/Ferguson? 15 might not be enough.