Types of Backpacks

What type of backpack do you need? Basically, it all depends on how much hiking gear and food you carry, and how long you'll be gone. Other factors to consider are the time of year, the type of terrain you'll be travelling, and how many luxuries you like to bring along. One person's weekend pack could last another person a full week.

Generally speaking, the type of backpack (it's name) refers to it's capacity.

Daypacks
Less than 3,000 cubic inches (15-35L). Small packs with little or no internal frame to support loads. All weight is supported by the shoulder straps. Daypacks are great for short day hikes with minimal equipment or can be an ultralight overnight pack for summer camping. Look for a waistbelt to keep your load centred and padding along the back for added comfort.

Alpine Packs, Weekend Packs
3,000-3,999 cubic inches (35-55L). This is a medium-sized backpack ideal for weekend trips. It can hold all your essential hiking gear, plus clothing and enough food for 2-3 days. They usually have some internal stiffeners and a more substantial hipbelt that bears some of the weight.

Backpacking Packs, Weeklong Packs
4,000-5,999 cubic inches (55 - 75L). If you own only one backpack, this is your size. It is designed for a winter weekend, or for a week (or more) in warm weather. They have a frame that gives structural rigidity and transfers the load from your back and shoulders to your hips.

Expedition Packs
6,000-plus cubic inches (75 - 100L). Because of their collossal capacity, these packs are ideal for extended backcountry travel, full expeditions, and gear-intensive winter outings.