Features of the Exped Transfer Wheelie Bag Clever transport and protection bag on wheels for packs and duffles Converts any type of bag or pack to a roller duffle Roll-top allows volume adjustment for packs 40 - 80 The backpack's suspension system is accessible through a zippered opening Durable aluminum grab handle and strong side handles Durable and silent wheels Also perfect in combination with Exped Tempest Duffle 100