So, a 30 liter backpack has a capacity of 1800 cu in (30 x 60) or about 1 cubic foot. You can put 1 pound of stuff in there or a100 lbs, but the limitation is that it would have to fit in a 1 cubic foot container.
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, a 30l backpack should fit in an 18? laptop, a pair of tennis, books, a change of clothes, keys, pen and all you need for your daily commute. In terms of weight, a 30-litre backpack should be around four to six pounds.
Their capacity lets you carry an extra layer, food and gear for day trips. 21–35 liters: This is the sweet spot for most hiking and travel daypacks. There's enough capacity to hold food, clothing and some extras, like a camera and a book.
A 30 litre backpack is plenty, but can be a little bit small for versatility. * You need 3 changes of clothes, so that you can wash a new item each day, and have at least 2 days for it to dry.
Some feature extra pockets for staying organized. Their capacity lets you carry an extra layer, food and gear for day trips. 21–35 liters: This is the sweet spot for most hiking and travel daypacks. There's enough capacity to hold food, clothing and some extras, like a camera and a book.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night. (Larger packs can more comfortably accommodate extra clothing, a warmer sleeping bag and a 4-season tent, which typically includes extra poles.)
2-3 Day Packs: 35-50 litersA weekend backpack like a standard 40L backpack is big enough to carry a backpacking sleeping bag, small tent, and pad, as well as extra clothing and layers.
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.
Large suitcases: 2 to 3-week tripLarge suitcases have a height of around 75cm. These suitcases are ideal for a 2 to 3-week trip, like to the French Riviera. The suitcases have a capacity of about 75 to 91L, which equals to about 15 to 20kg of luggage.
As a rule of thumb, 25-30 liter backpacks are best for shorter weekend trips, while 30-45 liter backpacks are best for longer trips or long-term travel.
Plan on bringing four shirts per week, and two jackets to layer for warmth (if you're traveling to a cool or cold destination). For a two-week trip, you need four bottoms and eight tops. Pack one or two dresses if you plan on going anywhere fancy, and bring athletic gear if you think you'll hike or exercise.
BACKPACKS BETWEEN 35–50LIf you want to embrace the 'packing light' philosophy on multi-day hikes, this size will still work for you. You'll need expensive light-weight gear to make this work, though. If you're sure not that everything you need will fit, then choose a backpack that's 50L or larger.
Larger than the 30L Travel Bag, the 40L Travel Bag is designed for longer excursions. Some might say a week, but we think you don't need much more for a month than you do for a week, so we'd definitely take this on a multi-month backpacking trip around Europe or South America (or wherever).
BACKPACKS BETWEEN 35–50LIf you want to go on an overnight hike you'll need a hiking backpack big enough to see you through the night. If you want to embrace the 'packing light' philosophy on multi-day hikes, this size will still work for you.
Under 10 liters: Slings and waist packs in this size work for everyday basics. 10 to 19 liters: For light loads and 13-inch laptops. 20 to 29 liters: Best for students and 15- to 16-inch laptops. 30 to 39 liters: For super-size workloads and weekend trips.
While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.
Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you.