It’s the biggest you can bring as a carryon, so it’s pretty much the standard onebagging size
The size of the backpack you choose will depend on how much stuff you plan to bring
For a multi-day, or weekend hike, a 45L to 55L backpack offers enough volume for the average backpacker
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I want a pack for weekend to week long trips, and prefer a darker green color or just camoflauge
Once you go into the 40-50L range those packs are generally designed for ultralight or advanced backpackers who bring very lightweight gear
It’s big enough to carry all the essentials, a light jacket, food/water, etc
One of them is my daily pack for work, and also my most common day hiking pack, I've had it for 10 ish years and not a thing wrong with it
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If you're planning a longer trip or need more space, the Osprey Rook 65L could be a better fit
My 46 lire carry-on sized backpack starts the trip at 35 litres at most, all the compression straps are pulled tight
An ultralight backpacking pack will not do well for climbing
Ain't no doubt about it, if you are used to a 30 liter bag, 40-45 liters is a lot more
Best Backpack for Weekend Trips: Osprey Aura AG 65 and Osprey Atmos AG 65
I've accepted that 30-40L is a travel bag and 20L is the largest I'd go for an EDC/coffee shop/weekender backpack
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On the flip side, 20% will feel like nothing on flat ground if you're in good shape
The backpack is basically the last piece of gear I choose when gearing up for an adventure