Thirty litres sounds abstract until you pack it. The Overnighter 30L comfortably holds 2–3 shirts, a pair of trousers, underwear, socks, a toiletry kit, a 15.6-inch laptop with charger, a water bottle, and your phone and wallet in quick-access pockets. The clamshell opening means clothes lay flat instead of getting wrinkled in a top-loading bag. Compression straps keep everything tight when you pack light, and the bag does not look half-empty on a day trip the way a 40L backpack would.