A well researched and field-tested checklist for backpacking
Big Agnes Lost Dog 15
Comfortable, light, packable, spacious, cozy and warm. It also has a sleeve that attaches to your pad like a fitted bedsheet to keep you centered on your pad all night long.
Sawyer Mini Water Filter
Super lightweight and packable. Can use with any water bottle or a Cnoc Outdoors 3L bag, which makes for easier and faster filtering.
Headlamps are a commodity but make sure it has a red light to preserve your night vision and friendships with the people you camp with (shining red light in people's face is much better than white light).
CamelBak Crux 3L
I wouldn't go off brand, have seen them break/leak too many times and water is kind of important. Stick with CamelBak or Platypus.
Comfortable, breathable (armpit zips are a must) and most importantly, waterproof!