The 65 literally bag is the perfect size for an adult. And this bag is super efficient on space, keeping everything tidy and easy to carry without being overly bulky, like some carry bags. The boot compartment is lined with a waterproof material,so nothing else gets wet and it's easy to clean. The helmet compartment is big enough for helmet, goggles, neckwarmers and even a jacket. Two side compartments are perfect gloves, a hat for walking to and from the lodge and any other items you want easily available. And the front picket can hold ski pants and two jackets snuggly. Lots of compression straps are available and the backpack shoulder straps are nicely adjustable and very comfortable for carrying the full pack. I've been using this for several weeks and couldn't be happier.