It really is a lot of fun to have a sandbox to carry with me because I can break it out anytime I'm feeling creative or just want to smoosh some sand around.
There are three parts to making a successful pocket sandbox: the sand, the tin, and a storage compartment. I wanted sand that would hold it's shape well but I also wanted it to stay moist longer and not spill everywhere. I soon realized that if the sand had any moisture that there was a good chance that the tin would rust so I had to take care of that. The final thing I wanted was an area to store any of the sand tools I wanted to go with the pocket sandbox. Read through this Instructable to find out how to make your very own pocket sandbox.
Step 1: The Sand
-a container to mix in
Mix the sand, cornstarch, and water in a 4:2:1 ratio. I did 1 cup sand, 1/2 cup cornstarch, and 1/4 cup water. I poured the cornstarch over the sand then added water. Add the water slowly because you may not need it all. You're looking for a crumbly consistency so that the sand is moist enough to stick together well but dry enough that you don't see liquid pooling.
Step 3: Storage Pocket
I used one of those small plastic spoons you get when testing ice cream flavors as a shovel for the sand but you could even make cute little molds out of clay or something if you're creative enough.