Only One .. rather than an I got a "X" and its good .. brand touting , given I got my backpack 20 years ago,
and Dana Deigns was bought out , I expect a while ago , and sewn bags are not waterproof,

but there are really nice bags made in sewing shops..

You can always buy a river runner's DRY BAG and put it inside the back pack you have..

simple to make seam welded sealed bag with roll and snap closure , without back pack straps attached
then that seam sealed, ... it will be cheaper too ..

one of many seam welded dry bags ..
http://www.ortlieb.com/_prod.php?lan...kt=drybag_ps10