I purchased the Jansport Mesh Back Pack for my husband's birthday to replace a similar mesh Jansport he had which has somehow disappeared.  It is very and lightweight with a slight rigidity to the frame.  The inner pocket with the Velcro closure is really nice for keys, a wallet, cell phone or other small items.  It would be even better if there were elastic bands on either side of the interior lower walls so that one could secure a small water bottle.  There are no pockets or water bottle holders on the exterior as other back packs have.  It will fit flat into a carry-on suitcase, which is helpful.  We have not tried it out with it loaded with anything yet but believe it will come in very handy for an upcoming trip to Disneyworld in December.