I’ve heard these described as French, German and Swiss, as well as World War I and World War II baskets. I believe they first appeared during World War I in Europe. To simplify things in your internet search, type wicker ammunition basket and you’ll find the most complete list of sources.
These charming baskets are long and shallow, and many have straps on the side for carrying. They often have a combination of letters and numbers painted on the front in black, adding a graphic touch. While I’ve heard of people using them to store everything from umbrellas to cookie sheets, I love this designer’s idea to use one as a sculptural object on the wall.
Related: How and Why to Use Wicker Baskets