The L stands for Liters. So when you see a 25L backpack, that means the capacity of the main pouch is 25 liters.
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Backpack capacity is almost always measured in liters - a universally accepted standard unit - which makes it much easier to compare backpack sizes across brands. 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.
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.
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.
Most bags range from about 30L (1,800 cubic inches) all the way to 100L+ (6,000+ cubic inches). I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag.
A standard hold bag is 23kg up to a maximum of 32kg per bag. No single item can weigh more than 32kg, or exceed the maximum total size of 275cm. Baggage can be purchased online, over the phone, or at the airport and the price will depend on the route, season, flight and time of booking.