if your gear doesn't fit in the 50-60, take less gear. YES! 85 liters 20 liters too big and 2-3 pounds too heavy. If you fill up that pack it will be way too heavy and if you don't fill it up it won't carry well.
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Most of the time, you do not need 85 liters worth of capacity. That being said, it isn't going to hurt to have the extra space if you ever do need it. There's really no reason not to have extra space since it can be cinched up by compression straps anyways.
Size Matters (but Bigger Isn't Better)Like a few other things in life, size matters when it comes to choosing a backpack — but not in the way you might think. Based on many years of dragging excessively large backpacks around the world, I have to say bigger is not better. You do not need an 80 or 90 litre pack.
So as stated, if your bag as packed ('condensed') does not exceed the maximum linear size as stipulated by your airline then there should be no hurdle to using an 85L backpack. The ideal volume for a backpack is a function of its dimensions. Most airlines allow carry-on luggage up to 22 x 14 x 9.
The design of the 70L is perfectly suited for airplane carry-on or check in, and the features of the 70L are perfect for any adventure once you arrive at your destination. Being able to compress the 70L allows you to use it as carry-on for all major airlines in the US and Canada.
24-26 liters is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane.
Multiday (3-5 nights; 50-80 liters)Packs in the 50- to 80-liter range are also great for shorter trips where you pack a little more luxuriously or multisport activities like backcountry skiing.
The hip belt of a well-fitting pack will be centered on top of your iliac crest. It won't be any higher or lower. If the hip belt slides below your iliac crest while you are trying on the pack, then it is too big. If it rests on your lower back, then it is too small.
Effects of an overweight backpackAn overweight backpack causes the body to compensate for the extra weight. If you lean forward to compensate, it reduces your balance making it easier to fall. The extra weight can distort the natural curve of the middle and lower back, causing muscle strain.
Admittedly, I have many, many backpacks, and I often get more looking for an ideal backpack for the occasion. I got the XL (30L) version of this backpack.
20 to 29 liters: Best for students and 15- to 16-inch laptops. 30 to 39 liters: For super-size workloads and weekend trips. 50 to 80 liters: For hikers and campers.
Normal backpacks or daily backpacks have volumes where you can easily fit small items that may be needed at work or school during the day. Their volumes vary between 15 liters and 30 liters.