Please choose the correct ending to complete the given sentence: Youth: [header] How to wear a backpack [title] Adjust your backpack. [step] Before you fill up your backpack and start wearing it, you will want to properly adjust your backpack. Adjusting your backpack can help make it more comfortable and help prevent injury.

Ending1: [substeps] Slip on your backpack to make sure it is loose enough to breathe comfortably inside of. Loosen the clips on your backpack's straps as well. Ending2: Make sure your backpack fits properly before you start regularly using it. [substeps] Most backpacks will have an area on the straps that you can use to adjust the length of the straps themselves. Ending3: [substeps] Loosen the buttons on the front and backs of the backpack tight at the top and bottom, and adjust the buttons to the front and back of your backpack in a diagonal fashion to make it more comfortable. Tighten holes, handles, buckles, straps, fasteners, and other small tweaks to help keep the backpack sturdy and within your visual clues. Ending4: For example, if you are going on an overnight trip, you may want your backpack to be smaller than you think it is going to be. Try testing your backpack next time around and adjusting the strap once or twice in the middle of the day.

Answer format: ending1/ending2/ending3/ending4