Choosing the right backpack size can feel tricky, whether it’s for school, hiking, or travel. I’ve gathered the most common questions people ask about backpack sizes and answered them in a clear, simple way. From 20L school packs to 60L trekking bags, this guide will help you pick the perfect fit. Part 1. What size backpack is best for school? For school, a backpack between 20L and 30L is ideal. This size offers enough space for books, notebooks, a laptop, and other school essentials without being too bulky. If you need to carry extra items like gym clothes or a lunchbox, a 30L backpack might be better. Look for padded