Visiting a college friend in Seattle this weekend? The Kelty Hub Carry-On Backpack has plenty of room for a change of clothes, a rain jacket, and toiletries. On the way there, carry this expandable pack as a briefcase or backpack. Either way, the Hub Backpacks TSA-approved carry-on size will make it on the plane. When you get to the hotel, take out the included hanging toiletry kit and clean up for your dinner date. If you find that youve gone a little overboard shopping at Pike Place Market, no worries. Unzip the expansion zipper, add 500 cubic inches to the Kelty Hub Backpacks capacity, and check this bag for your trip home.