On my last trip (4 people, 11 days) I used a combination approach, 4 Ursacks and one bear canister.  The Ursacks keep bears (and other critters) out, but are subject to being crushed.  So the Ursacks contained all the stuff that crushing would not hurt which was most things (rice, dried hamburger, etc, etc).  The canister stored anything for which we wanted crush protection (oil, syrup, etc).

Ursacks are nice because they are light and they decrease in size as food is consumed.  Bear attacks are rare (I have been fortunate to never experience one), so as long as the Ursacks protect my food from loss, risking a little crushing is a gamble I consider worth taking (risking total loss by hiding is not a gamble I am willing to take).

Now Ursack sells a liner that provides crush protection as well.  But I question if the liner is worth it.