As we’ve said before, finding the right backpack is important. Spend time researching and get the one that fits you and your hiking style. You’ll appreciate the time investment after several hours of carrying a good pack.
 
FYI – Since 2015, we have mostly used the Osprey Exos 58. We love it and we aren’t alone. It was the Top Backpack of 2017 on the Appalachian Trail. It is light (not ultra) and adaptable. It carries loads of 15 to 35 lbs. with ease. We can be tough on our gear, so Osprey’s lifetime warranty is another point in their favor.

FYI – Finding the right backpack is super important. Youl need to spend some time researching packs, and this article will help.
 
Domonick Zanarini wrote a well thought out, thorough backpack review over at The Trek.

Summary

• Osprey Levity / Lumina 60L ($270, 1 lb 13.3 oz) or Osprey Levity / Lumina 45L ($250, 1 lb 12.2 oz)
• The tester liked the fit and feel of the pack. “I can confidently say this is one of the most comfortable packs I’ve ever worn.”
• They didn’t like the side pockets, but they use a large diameter size water bottle than probably most people, which made it difficult to get in and out.
• The tester didn’t like the top lid compartment.
• They noted the lack of chest and hip belt pockets. FYI – This is a big drawback for us. We use those pockets all the time for snacks, water bottles, phone, camera, etc.
• The tester noted that the silnylon material which makes up the main compartment felt delicate.
• Even after all those knocks against it, the tester still rated it 8 out of 10 overall.