I use 2 Sterilite tubs with locking lids that are the W X L X H of my Granite Gear food pack  I believe SD uses a similar set-up. I put a 1" piece of close cell foam on bottom of pack so if I set pack down hard or on unseen object, it won't crack the food boxes. I also wrap a old Thermarest Ridge Rest sleeping pad around the boxes in pack.
Serves 4 purposes. Between the close cell foam base and foam " wrapper" the food pack will float fully loaded. The also add an insulation factor. The foam bottom and wrapper also protects and muffles any banging you get when/if the pack is hit. Last but very nice, is that in camp I have that cut down Ridge Rest as a ground insulator seat, or under my sleeping pad if I have to settle for less than desirable ground conditions.
I also made a homemade silicon gasket for the food box lids. Put a 1/2" bead around the inside of lid, put plastic wrap over box edge and locked lid overnight. Helps cut down on any errant food odors. All the food in boxes are sorted and secured in zip-locks.
I'm a hanger, so my 3 pulley rope system sits on the top with room to spare, along with stove/cook gear.
I had Kondo's add compression side straps to my food pack and I added two OR gear packs, one on each side. I carry fuel bottles/ trowel/ misc items in there.
In camp the boxes are nice for preparing food. I can sit on one box on the Ridge Rest, and use the other's top for meal prep. So far they've held up under a few trips with no damage. They're cheap and like db's big Rubbermaid, they make finding things very easy.