Love the bag not too keen on the material

I've had this bag for 3 years and it is THE vacation bag. When we were in Disney World I was able to fit our rain jackets, sunscreen, sunglasses, wallet and water. Actually my husband is always amazed at how much I can fit into the bag.I don't like the material and have problem with the strap staying at the adjusted length. That's the only 'downside'