Me and my little family will be flying from CA to NC for a weekend visit to see my son stationed at Camp Lejeune. Since its only for a weekend I know I can get each of us to fit what we need in a backpack or tote bag. If its within dimension guidelines. Can we get the backpack to pass off as our Personal Item or would we have to pay carry on fees?

Examples of a couple of the bags we are planning on using…
http://www.grunt.com/usmc-digital-desert-attache
http://marineparentsinc.com/store/sh...spx?itemid=420