Here's a tutorial you may enjoy, Julia:

https://www.hometalk.com/37741725/outdoor-ottoman

Outdoor Ottoman

Hi Julia, here's a tutorial on how to build an outdoor storage ottoman https://jenwoodhouse.com/strong-tie-storage-ottoman/

If you can find an old wooden box with a lid upholster it and cover it with weather proof fabric. You could also build your own box with pallets

I found an old ottoman at a garage sale and redid the cushion with a vinyl tablecloth and new foam. I painted the legs with an outdoor paint from DecoArt. It is so comfy and adds some color too. https://michellejdesigns.com/outdoor-footrest-makeover/

I love how this one can serve as an ottoman an outdoor coffee table: https://jenwoodhouse.com/strong-tie-storage-ottoman/