Versatility is the key here. The Berghaus Mule 40+20 (www.berghaus.com) expandable kit bag is designed as a medium capacity travel bag for weekend trips and short expeditions. It's been great as a carry-on bag on the way out and as checked luggage on the return from a trip when the inevitable souvenirs have accumulated. Complete with two 10l zip out extensions, the Mule's capacity adds flexibility to packing. Tough and durable, this bag is also comfortable to carry
Features: plenty of space for gear with the 40l + 20l capacity, internal mesh pocket, large end pockets, zipped front pocket and compression straps, lockable zip pulls, padded carry handles and a store-away shoulder strap.