As far as I have seen or read, there are not particular laws/ords that suggests how far away makes you "too far", on the other had "on your person" is where most of the laws cite the weapon as being located. In your bag and not on your shoulder/back is most def not "on your person".
ALL THAT BEING SAID,
I CC to the beach all the time and will leave it in my bag while in the water. The bag is always with someone and never left unattended. I suppose we run the risk of the bag being stolen and the weapon along with it.
Maybe my practice is poor, but I see no problem with it. We are adults, we make our own decisions.