What Size Hiking Backpack Do I Need? A Complete Guide to Choosing the Right Backpack Capacity

Choosing the right hiking backpack size is one of the most important decisions before starting any outdoor adventure. A backpack that is too small may not have enough space for essential gear, while a backpack that is too large can add unnecessary weight and make hiking more difficult.

The ideal hiking backpack depends on several factors, including hiking duration, destination, weather conditions, and the amount of equipment you need to carry.

Whether you are planning a short day hike, a weekend camping trip, or a long-distance backpacking adventure, selecting the correct capacity will help you stay comfortable and organized.

In this guide, we will explain how to choose the right hiking backpack size and compare popular capacities, including 30L, 40L, and 65L hiking backpacks.

Understanding Hiking Backpack Sizes

Hiking backpacks are usually measured in liters (L), which refers to their storage capacity. The larger the number, the more gear and supplies the backpack can hold.

However, bigger does not always mean better. The best hiking backpack size should match your specific outdoor activity.

A general guide:

• 15L–30L: Short hikes, day trips, and lightweight adventures
• 30L–40L: Weekend hiking, overnight trips, and moderate gear loads
• 40L–60L: Multi-day trekking and camping trips
• 60L–70L+: Long-distance backpacking and extended outdoor adventures

Among these options, 30L, 40L, and 65L backpacks are some of the most popular choices for hikers because they cover a wide range of travel needs.