Thanks guys,  I appreciate both responses.  My main hypothetical use for this would be so that I could get by with just one pack on portages.  I recognize the issue about keeping food separate, and your point is well taken DB.  I am certain I can get all my food in here.. I'm a just add water + a fish guy, so my food doesn't take up too much room.  I'd sure like to be confident, though , about food odors and shoving it in my main pack on portages.  I'll let you know if i figure out a way to feel good about it.  So far I'm not there.