WATERPROOF SELF PACKING AND WEIGHING ONLY 8 OZ THIS IS AN ALL ADVENTURE MUST HAVE. The Women's Ultra-Pak is the perfect garment for women on the go. The featherlight weight of this jacket, with its storage pocket, makes the Ultra-Pak ideal to throw in your purse or pack. Take the waterproof protection with you wherever you go and be prepared for anything mother nature can throw at you.