@tristanofalls& @ibexdoc gave some great answers here! The amount of gear you plan to bring on a trip will greatly impact the capacity of the backpack you purchase. If you have a heavier tent or simply love camp luxuries like chairs and bulky snacks (I love these!) then you will end up needing a larger pack volume. I highly suggest a compression sack for your sleeping bag if you don’t already use one. This will save you some extra space in your new backpack! We have an Expert Advice article called How to Choose a Backpack with some great information on what which backpacks are suitable based on the length of your trip. Happy Hiking!