The following merchants feature lightweight luggage from the top luggage manufacturers.  As part of your search, be sure to look at the Delsey Helium 100 and Delsey Helium Breeze luggage collections.  These are lightweight, well made pieces of luggage that have received very favorable reviews from people who have purchased them.  The Delsey Helium 100 collection

Irv's Luggage Warehouse
Lightweight luggage from Atlantic, Delsey, Hartmann, International Traveller, Samsonite, Travelpro, and Victorinox.  Click on the Luggage tab at the top of the first page, and then look for the "Lightweight Luggage" link on the left side of the next page.  Free UPS ground shipping on orders over $99.

eBags

Look for the Lightweight Luggage link on the left side of the first page.  eBags carries an extensive inventory of luggage, and has lightweight luggage from many manufacturers.  This merchant often offers free shipping on orders over a specific dollar amount -- see their website for details. eBags has an extensive database of customer reviews on individual pieces of luggage.

Luggage Online
Click on the Luggage tab at the top of the first page, and then click the Lightweight Luggage link on the left side of the next page.  Featuring lightweight luggage from American Tourister, Andiamo, Atlantic, Briggs & Riley, Eagle Creek, Delsey, Heys, International Traveller, Kenneth Cole, Ricardo Beverly Hills, Samsonite, Skyway, Travelers Choice, Travelpro, and Victorinox.  Free Shipping (orders over $125) and Free Returns -- see website for details.

Magellan's
There is no Lightweight Luggage page at this merchant's website, so you'll have to search through several pages of luggage.  However, they do have several collections that are very lightweight.

Click Here for our Lightweight Luggage Buying Guide