Goggles strap: Outside your swimcap, or inside?

I haven't ever seen anyone strap inside while training, but many do while competing. Some double cap. Inside cap, goggles, outside cap. I always strap inside, training or competing.

I haven't ever seen anyone strap inside while training, but many do while competing. Some double cap. Inside cap, goggles, outside cap. I always strap inside, training or competing.