Dry Bags and Waterproof Duffle Holdalls. Drybag Duffle Bag from Highlander will be up to the challenge to keep your belongings safe and dry. These fully versatile bags can be used as wash bags, camera bags, rucksack liners or minimalist rucksack. 100% totally waterproof rucksack that is ideal for use in wet weather conditions when you need to keep your kit dry. It is perfect for hiking, camping, canoeing, kayaking and any outdoor activity where you are exposed to the elements.