Ultra Light Spray SkirtThe Alpacka Ultra Light Spray Skirts for whitewater decked models, past and present, is the lightest weight and most simple option for your Alpacka. See options below to make sure you get the correct size. We only recommend this skirt for Class III or below. For Class IV and up, we highly recommend the IR Sixmile Spray Skirt. Weight: 7. 5oz 210g Standard Skirt: All 2017 and later single person packrafts with whitewater decks feature a 98 inch cockpit.