Crates! They seem simple but they take a bit of design and special wood to create crates that look good and don’t weigh a ton. They need to be planned out so they are consistent in their aging and weathering.
There are many types of crates too. Crates for swords, cannon balls, tea, wild animals, you name it.
I create special stencils and labels for my crates too.
More details. Faux bird poop too.