I made this leap too! I bought a larger Fairview 70 l back pack for our upcoming trip, but it has to be checked. I did a test run on a biz trip back east with this 70l pack and it was great and freeing to be hands free not to have to roll a bag. Especially when we had steps to navigate to our hotel room. After reading about the baggage issues, my husband and I bought the 40l Osprey's.
I got the women specific Fairview- he got the Farpoint. When I saw the 40l I thought "no way will everything fit!" But it does! It's amazing how much it can hold. Having a women's specific bag makes a huge difference, too. I'm petite and got the small size. It is so comfortable.
Hints:
I created a capsule wardrobe. I packed my new 40l bag with everything I want to take to Europe. Shoes, coats, outfits, makeup, sundries--everything I needed to feel and look great. Everything fit and I didn't do a perfect job packing. The bag weighs less and I can easily lift it. I am very excited to be backpacking through Europe 40 years after I thought that would be cool to do-hahahahaha. It will easily fit in the overhead bin.
I figure I can buy sundries there if necessary if I run out of something. No "just in case" stuff. We will be using DHL to ship purchases back to the states-- part of our pre tour is going to buy Christmas gifts in Germany. Shipping can be expensive but it's worth it to us.
I use an app called Smart Closet that catalogues all my clothes, shoes, bags, etc. It's easy to go through and combine outfits--it's amazing how few clothes are really needed when you start playing with combinations. Whether or not you use an app, just put everything out on the bed and start mixing and matching. I ended up editing a knit dress out and substituting a skirt. The dress would've been great but took up too much space.
I bought some bungy cords to help secure my lightweight puffer coat to the outside of my backpack so it is not only accessible, but doesn't take up space in my bag. We are going in the fall, but the weather forecast will have the final say as to what I'll pack of course.
I bought a super cool washing bag on Amazon to easily rinse out clothes--this cuts down on bringing undies and socks. Most of my 1 st layer clothes are quick drying.
I'm very excited about us using these Osprey packs and being nimble and free without dragging a bag and being forced to be organized and creative. It's quite fun really. Bottom line-- I think you will love the 40l Fairview and it will fit everything you need.