I'll be going to England for a week next May and I'm looking for a travel pack that won't break the bank. I like the convertible type (i.e. works as a backpack but has handles and a shoulder strap). Some brands I've been looking at are Eagle Creek (Weekender or Tarmac), ebags Weekender, Tom Bihn Aeronaut, Air Boss Sky Train, MEI Voyageur, Tortuga.
Any recommendations/advice?