I priced these hard both on the internet and on amazon.  i wanted them more for storage of stuff, including emergency supplies.  there are cheaper ones out there, but i am still glad i got these and intend to buy more.  first they are a higher quality fabric than other cheap ones. second, the straps seem secure and it has a shoulder strap.  it also has exterior pockets. the zippers seem good and it has a wide opening top.

if i were getting one for airplane travel use, i would probably not get this one and would want to see it in person.  i have some others for that purpose and the fabric is a lot better.  note the extra large is BIG and if packed full would be hard to carry and heavy.  if you intend to put heavy stuff in it and carry it, think about the large instead. these would also be good for occasional use, like beach or picnic.