A water-resistant-only pack uses basic fabric that sheds light moisture but skips the DWR (durable water repellent) coating and sealed seams found on higher-end options. It's the most budget-friendly choice and works fine for dry resort days where your pack mostly rides the chairlift with you rather than sitting in the snow.
The limitation is that sustained or wet snow—heavy powder, coastal storms, or spring slush—will eventually soak through. If you're carrying extra layers, electronics, or snacks, they could end up damp. This isn't the pick if you regularly set your pack down in the snow or ski in variable weather.
If you go this route, stash your phone and electronics in a small dry bag or ziplock inside the pack. It's a cheap workaround that adds real protection. But for anything beyond casual, dry-condition resort laps, stepping up to a DWR-coated pack or one with a rain cover is a worthwhile investment.