Yes, the weight of the cart and the material in the cart must not exceed 45 kg (100 lbs.) for a small cart or 90 kg (200 lbs.) for a medium cart. Green Carts are not available in the extra-large size.
If you can easily roll your cart, it is likely not overweight. If your cart is too heavy, remove some material and save it for your next collection day. If you are putting heavy material in your cart such as apples that have fallen from your trees or wet leaves in the spring, you may want to fill your cart only half full.