Urban Worm Bag Description The Urban Worm Bag is a breathable, sturdy worm bin. It comes complete with a strong and durable iron stand. Easy to assemble and great for in-home composting. The zip-tight design keeps pests out and moisture “just right” for creating the best compost around. Buy bags without a stand for as low as $69 or with a stand at $109, a great deal, perfect for in-home vermicomposters.