So, you're going camping. You can only have a bag so big so it will fit in the pack. One problem- you don't know how to pack that light! Don't worry. Here's how.
Step 1
Think of where you're going and what you'll be doing. For example-tenting in the woods on a lake or staying at a campsite with lots of other people. Search for suggested packing lists on the internet.
Step 2
Prioritize. Since you'll be swimming almost all day,every day, swimsuits are a must. Bring a few so there will always be a dry one. Think of your head, your body, and your feet. All of these will need to be covered.
Step 3
Pack for the weather. If it's going to be 20+ degrees, you probably only need one long-sleeved shirt and maybe a pair of sweatpants. It can cool off at night, however. Think of all scenarios. Don't forget your rain-gear!
Step 4
Cram it all into the smallest pack possible. Don't pack anything you wouldn't mind getting dirty, wet and wrinkled to no end.
Step 5
If you will have to carry your pack any distance, put the pack on and walk that distance at home to see how it feels. To get it even lighter, unpack it all and lay it out on a flat surface and prioritize again. When camping, you don't need a clean shirt every day, for a week trip you need only need about 4 shirts.