Prioritize fit and comfort above all. A well-fitting backpack should match your torso length and distribute most of the weight to your hips, rather than your shoulders. For first-time campers, a 40-65L pack is ideal for 1-3 day trips. Look for padded shoulder straps, a sturdy hip belt, and breathable back support for all-day comfort. Bonus features like hydration compatibility, external gear straps, and a rain cover are helpful, but only after you've nailed the fit. Try it on with weight ( if possible) before buying to make sure it feels right.
Test it loaded, not empty. Pack 10-15kg and wear it for 15+ minutes. The hip belt should carry most of the weight, and the pack should stay close to your back without shifting. For most first-time campers, 50-65L is the right size. Enough for multi-day trips without encouraging overpacking. Look for a backpack with an internal frame to keep the load stable, side or front access so you don't have to dig from the top, and external loops to attach wet or bulky gear. A ventilated back panel is also useful if you're hiking in warm conditions.