On a backpacking trip, there’s only so much you can stuff into that one backpack. So it’s absolutely necessary that you carry along only the most essential items.
Depending on the climate of the region you’ll be backpacking in, pack the most appropriate type of clothing. So if you’re going to be backpacking in Eastern Europe make sure you have lots of warm clothing. However, if you’re going to be backpacking in Mexico, then do not waste precious space in your backpack with warm clothing that you are probably not even going to use much. Perhaps just one sweater with a hoodie would be fine for a chilly night in a generally warm region.
Also, since you’d be doing lots of walking in the sun on a backpacking trip, it’s important to have a good sunscreen. Yes, sunscreen is not just for girls. It’s for anyone who does not want to get their skin completely burnt. Good footwear is a must. One pair of walking/running shoes and one pair of flip-flops should suffice. Finally make sure that your backpack is a high-quality durable one that can survive the various elements of weather. Armed with all of the above, conquer that backpacking trip!