During your days on the Kilimanjaro trek you will need a proper and appropriate backpack to carry. This same pack is the one you should use on all your training hikes in order to become comfortable carrying the weight, gear and equipment you will be using on your climb. Backpacks come in many sizes and styles and fit each body differently, so it is best to be measured and fit by knowledgeable sales staff at a quality outdoor store.
Here are some things to consider when shopping for your backpack:
Size: The interior volume of your backpack should be something between 25 and 30 liters or 1,500-2,000 cubic inches.
Fit and Function: You should consider an internal frame backpack with a moderate suspension and quality zippers. It should have padded shoulder straps, sternum strap, load lifter straps and because as much as 80% of the weight is supported by the hips, fully padded hip/waist belt. You should also consider purchasing a rain cover if the backpack you pick does not already come with one. Most brands offer a custom fit, or built-in rain cover that protects your pack and its contents during inclement weather.