The single most common mistake hikers make is buying too much pack for their needs. A 65-liter expedition pack on a day hike is dead weight, wasted money, and an invitation to overpack. A 22-liter daypack on a three-night trip is a recipe for leaving essentials behind.
Daypacks in the 15-30 liter range are built for simplicity. They skip the heavy suspension systems and load-bearing hip belts because they do not need them. The weight you carry on a day hike rarely exceeds 15 pounds, so a ventilated back panel and padded shoulder straps are enough. They shine on fast-and-light outings where agility matters more than capacity.
Multi-day packs in the 40-65 liter range earn their complexity. Once you add a sleeping bag, shelter, pad, stove, food, and water for multiple days, the load climbs to 25-40 pounds. At that weight, you need a real suspension system that transfers the load to your hips, a frame that keeps the pack stable on uneven terrain, and enough organizational features to keep three days of gear accessible.
If you only hike day trails, a daypack like the Osprey Talon 22 is all you need. If you camp overnight regularly, a weekend pack like the Gregory Zulu 45 covers most trips. And if you are planning thru-hikes or week-long backcountry trips, invest in a full-featured pack like the Osprey Atmos AG 65. The right size is the smallest pack that fits everything you actually need — and nothing more.
