The Exos 58 is a surprisingly comfortable pack, especially considering its 2.6 lb weight. It's fantastic carrying up to 30 lbs, and decent to 40 lbs, but we wouldn't want to carry much more than that.
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65 Liter Backpack. Lightweight, weighs only 4lbs 2oz.
The weight of backpacks that seals carry on missions can vary depending on the specific mission and equipment required. It depends on the mission. If it's a quick in and out or if they have vehicles their packs might weight about 20-40lbs depending on their position in the team.
Check your airline's carry on weight limits before you fly. Most likely, you'll be able to carry 15-22 lb. Choose a travel backpack that weighs 20% or less of that limit so that you'll have 80% of the limit for your stuff. When you start packing, remember to wear your heaviest stuff or put it in your personal item.
While both versions of the Osprey Porter are carry-on compliant, only the 30 liter version is smaller enough to fit under a plane seat. If you prioritize traveling lightly, or if you're pairing the Osprey Porter with another piece of luggage, then the Osprey Porter 30 will be a better fit for you.
The typical conventional backpacker has a base weight around 25 to 30 pounds. Conventional backpacker's total pack weight with food and water can easily exceed thirty to forty pounds.
But, based on my own experience, 70L is too large for a carry-on item with most airlines. If you're looking for the optimal balance between the largest bag possible, and the most airlines it would be allowed on, I find that 35L (53x35x20-cm) is allowed on 155 of the 175 airlines I could find data for.
If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.
Pack Weight for Backpacking and HikingA loaded backpacking pack should not weigh more than about 20 percent of your body weight. (If you weigh 150 pounds, your pack should not exceed 30 pounds for backpacking.) A loaded day hiking pack should not weigh more than about 10 percent of your body weight.
Pack Weight for Backpacking and HikingA loaded backpacking pack should not weigh more than about 20 percent of your body weight. (If you weigh 150 pounds, your pack should not exceed 30 pounds for backpacking.)
A loaded backpacking pack should not weigh more than about 20 percent of your body weight. (If you weigh 150 pounds, your pack should not exceed 30 pounds for backpacking.) A loaded day hiking pack should not weigh more than about 10 percent of your body weight.