There is technically no weight limit, but there is a size limit. When an animal is inside, the floor of the Pop 'N Go® Pets is flush with the ground so there is no limit to how much weight can go inside. For example, you could put a 100 lb kettlebell inside with no issue, but not a 100 lb dog. For this reason, we recommend using this product only for small and medium-sized animals (think small and medium-sized dogs, cats, bunnies, etc.). Large dogs (for example Great Danes, Mastiffs, St. Bernards, and others that typically weigh well over 50-60 lbs) may not be suitable for the Pop 'N Go.