I don't know who you are flying but, most airlines have big ol' plastic bags for them. Most have them for free, I know Delta though charges $5.00. Honestly, I have worked for a major regional airline for years and a cover bag is not going to protect anymore then a plastic bag. Actually, I have seen worst with the covers. They tend to get caught more in the belt loaders and other equipment then the bag. And if it is ripped it is not covered due to the fact a bag is meant to protect your belongings only. I would just save the money.