These instructions are for a 2019 Toyota Prius Prime, but they should work for most cars. Some people use a bungee cord, but I prefer this 1/8” Adjustable Rope Hanger I got on Amazon. It has carabiners on both ends rather than hooks, which is more secure. It also has a simple ratcheting mechanism to shorten or lengthen the rope.
To hold your trunk partially open, take one end of the rope hanger and push it into the locking mechanism on your trunk as shown below.
The lock will close, preventing the carabiner of the rope hanger from disconnecting.
Then, take the carabiner on the other end of the rope hanger and hook it onto the metal lock part that’s at the other end of the car’s trunk locking mechanism.
Lastly, pull on the rope that’s connected to the ratchet to make the rope hanger shorter.
