I bought 40L. I used this backpack for a 3 week trip to Europe. We've been visiting different cities and didn't want to worry about tons of luggage to lug around. In fact, I felt like I could get at least 5 days of clothes, 2 pairs of shoes and toiletries in this bag. The top hard top of the bag was great protection for things like sunglasses, phones, etc., but it felt a little clunky and an awkward choice for space utilization (especially when you're planning every inch of your luggage). I really appreciated the hidden passport/ID card pocket. We didn't feel like we had to lock our bags because we were in secure areas. I bought them when needed, but we didn't use them. The reason I chose this bag is because I'm 5ft 3cm and have a short torso - it fit best for a woman my size. My other option was Osprey packs, but they were all too big for my back. My husband chose the Osprey Porter 46L and he loved it. Hope that helps! :)
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