I often carry gear in a pannier on my bike rack, as in the photo below (not my bike, but same pannier design. My actual bike frame is very different; I'll upload my own picture tomrrow):
I have two panniers, but typically only use one because I usually have to carry the bag around with me at my destination, and carrying more than one bag becomes cumbersome.
The problem I run into is that when fully loaded (not beyond capacity, but close to it), my bike tips over when I prop it up with the kickstand. I always put the pannier on the same side as my kickstand, as I've learned that it tips over easier when on the opposite side.
What can I do to prevent my bike from tipping over when the pannier is too full? The easiest solution would be to distribute the load between two panniers, but that's impractical because of the challenges with lugging around two bags once I'm at my destination.
Do there exist kickstands with some sort of platform on the bottom to help stabilize them? Is my kickstand not positioned/attached correctly? Or is there some better way to balance things out so that my bike won't tip over?