30L is still a lot. It depends on your philosophy of one bag (I'm not a purist, I have a backpack and roll aboard right now in Wien because my friend was going to be traveling with a roll aboard. Usually I use a 30-35L bag and pack for three days with recharge / wash.
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Generally, a 30L backpack has a length of around 19-21? (or 48-53 cm) and width of 10-12? (25-30 cm). They generally weigh between 2.5 and 4 pounds. These backpacks are quite spacious too they generally have a depth of 10-12? (27-30 cm). So, you can quickly go on a trip of a few days with it.
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.
MEDIUM BACKPACKS (20 – 35L)This capacity range 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.
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.
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.
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.
30-50 liters: In general, luggage that has a capacity of about 50 liters or less is sufficient for a weekend trip. There are lots of carry-on duffels, packs and bags in this size range to choose from. 50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range.
40-50 Liters (The Ultralight Thru-Hiker)Expect to fit everything you could fit in a smaller pack, plus: A food bag that can hold up to 5-6 days worth of food. A pot for cooking. A camp stove and fuel.
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.)
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).
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
A 20-30 liter backpack is great for an overnight trip. The Small Knack Pack is only 15 liters when unexpanded - perfect for carrying your essentials with you during the day - but the expandable travel compartment allows you to easily pack a day's worth of clothing.