Biodegradable Leaf Bags Hefty Lawn And Garden Bags...biodegradable?

Hefty Lawn and Garden Bags...biodegradable? - biodegradable leaf bags

So we packed 5 bags of leaves in our garden, terrace and garden Deposit Bags. I see no indication in the box that the bags are actually biodegradable. Is it reasonable to assume they are? I had no information on an Internet search.

Thank you in advance.