You can buy the containers from any Army Disposal or Hardware store.
Pick a set distance, say 100 meters or so. Then pick up the containers and try to walk the distance without dropping them. Really try and crush the handles to dust! If you can't make it, drop the containers, rest a few seconds and then go again. Once you can make the entire distance, add some extra weight to both of the containers.
Simple yet brutal!
The best way to add extra weight to these containers is to start by filling them with water, a little extra each session. When they are completely full start to add sand or pebbles. Old fashioned but brutally effective.
You can even use dumbbells in the gym. Pick a heavy pair and go for a stroll. Pick two dumbbells with thick handles, the thicker the better. Be very careful with this. As soon as you feel them slipping lower them before they drop.
A falling dumbbell can injure you or get you thrown out of the gym (even worse!). Rest a minute then go again.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.