Most companies offer the same backpack style in two or three different capacity sizes. You can get away with a 40- to 45-liter model for a quick overnight or light weekend when you have less to haul.

USWE announces new VST backpacks for various applications including MTB, running, hiking, skiing, Trail and Adventure bikes ...

If you take your backpack to work, and all you need to carry is a laptop, wallet, chapstick, and notebook, look for a backpack that has the correct-size laptop pocket. I use the Rains in this ...

Ocean & Ground makes versions of this exact backpack in four different sizes from XS (4.5 liters) to L (17 liters); this is the size medium (10 liters). $66 at Smallable Buy.

A mid-size backpack–6 to 15 liters–should be spacious enough to haul your gear without impeding your mechanics. You should look for a larger bag if you plan to bring it on your commute.

Available in an autumnal palette of black, tan, and charcoal, this new size enhances the original version. Finally, the Valentino Garavani 9to5 bag makes its mark as an all-day accessory.

The best travel backpacks take the stress out of traveling—whether you’re taking a long-haul flight or doing a quick local getaway.

Looking for a new backpack, but don't know which type to choose? Well, we don't blame you. There are at least 23 different backpack types, each one intended for a slightly different purpose. That's ...