Bought these for my fence and had a few left over and took them camping this past weekend. We had some torrential rain recently and none of my normal stakes were holding. These did the trick.

DeerBusters Ground Stakes 12" Kinked Fence (30 Pack) https://www.amazon.com/dp/B01N05DE4Y/ref=cm_sw_r_cp_apa_zmNjzbTSV4WXT