Is the fabric sturdy enough?

It's not as rigid as hard-shell luggage, you know, it's designed to be foldable. This design choice results in a relatively thin material, but please rest assured that the material is sturdy enough to handle the weight of your regular travel stuff.

Is it big enough for a weeks worth of clothes?

Yes! It can definitely fit a weeks or two worth of clothes in it easily plus shoes and other items.

Is this duffle bag waterproof?

Yeah, it's made from water-resistant material, so it can handle light rain and splashes without a problem.

If I receive a damaged or defective bag, can I return it or get a replacement?

Yes, of course, if you receive a duffle bag that is damaged or defective, you can return it or get a replacement through Amazon's return policy.

How to clean and maintain this travel bag?

You can just use some mild soapy water and a damp cloth to gently wipe away any stains on the surface. Avoid using strong cleaning agents or soaking it in water. Just keep it dry and store it in a well-ventilated place.