Does anyone have a suggestion for a backpack which would be usable for an airplane carry on? The limit is 14 x 9 x 22. It would seem that it would be possible to get enough in a pack that size to survive for several days if your luggage got lost. I did a search but cannot find anything in past discussions. Cheap or used would be good. Durable and comfortable are not prime considerations. Hopefully it would only be used while in transit to and from the destination.