Another option, with caveats is surplus. A few words about catalog speak, 'miltary type/ style' or other phrases are euphemisms for really bad chinese knock offs. Condition is everything. Remember the various agencies dumped this stuff because it is either worn out, obsolete or in excess of needs and the expense of storage. Never buy any surplus rated at less than new, unissued or excellent. Anything else will have problems that potentially offset any savings. There are several european miltiary daypacks/mountain rucks whatever you want to call light recon bags/ bookbags. Most will be HEAVY canvas with leather and drawstring straps and if framed some steel iron maiden affair. Pay attention to the leather, even on good units it may be cracked badly enough to fail. Check canvas for mildewing. Even the good units benefit from a day in the sun with a good scrubbing and a treatment of scotchguard. Most have been in storage in what must have been a cheese cellar. Comfort can be improved simply by stowing blankets or clothing against the back. Definetely add reflector tape. A bit of psych ops for security is to stencil LAUNDRYBAG on the things and load spare clothing on top. If anyone gets curious while servicing your car it helps.