Like this :

seriously, I bought two black storage boxes from Wallyworld. They have a hinged lid and two latches. They arent waterproof so I just use them for camping gear. Found out the first time not to put a bag of marshmallows in there in July. Everything big like that gets strapped with cinch-straps, not ratchets but ones with buckles that you just pull tight. All other stuff gets bungees. I bought 3 big packs of bungees and a dozen cinch straps at Wallyworld. Extras have really come in handy.