Yes. Fold-flat or collapsible urban planter boxes do exist, but they usually fall into a few practical categories rather than one single standard product. Collapsible fabric raised beds are the most storage-friendly: when empty, they fold or collapse into a slim bundle and are lightweight enough for balconies, rooftops, and patios. They work well for vegetables and herbs, though they are softer and less decorative than rigid planters. Flat-pack modular planters made from wood or UV-stable plastic are another good option; they arrive as panels and corner pieces, assemble without special tools, and can be dismantled and stacked flat at the end of the season. Some hinged wooden crates also fold flat like a storage box, but if you use them for planting, add a durable liner and drainage holes, and check that the hinges and base can handle the weight of damp soil.
For small urban spaces, choose a model with drainage, a removable liner, weather-resistant materials, and a stated soil capacity. Avoid folding a planter while it contains soil; empty, clean, and dry it first. Also consider balcony weight limits and wind exposure, and use lightweight potting mix rather than heavy garden soil. If you need to store the planter often, a collapsible fabric bed is usually the easiest choice; if you want a more rigid, furniture-like look, a flat-pack modular wooden or plastic planter is the better compromise. True fold-flat planter boxes are less common than flat-pack or collapsible designs, so check the product details carefully for “folds flat when empty” rather than assuming every modular planter will store flat.