Titan 360 Four Diamond Edition 22-inch USA Carry-on

Tests confirm that four-wheeled spinner luggage makes it easy to maneuver and easier on the back than two-wheeled luggage, though it can get out of control on slopes. The extra wheels can make spinner luggage heavy, but the hard-sided Titan 360 Four Diamond Edition 22-inch USA Carry-on is extremely lightweight -- and very strong -- thanks to its polycarbonate shell. Its diamond-patterned surface proves basically scratchproof in a harsh Popular Mechanics test, and Titan's unlimited lifetime warranty covers even airline damage. A full line of Titan 360 Four Diamond Edition luggage is available in four colors. Users say the hard-sided Titan holds a lot, but some people prefer a soft-sided suitcase with some give, or an expandable gusset like you'll find on the luxury Tumi Alpha Frequent Traveler 22-inch Framed Expandable Carry-on (*Est. $595), mid-priced Eagle Creek Tarmac 22 (*Est. $230) and budget-priced Delsey Helium Fusion Carry-on Expandable Suiter Trolley (*Est. $75).

Popular Mechanics tests the strength and agility of a Titan 360 Four Diamond Edition suitcase against two other hard-sided rolling brands. BellaOnline.com's travel editor writes an in-depth, single-product review of a Titan 360 Four Diamond Edition carry-on. A review at USA Today discusses a Titan suitcase without the diamond-patterned finish, as do users at eBags.com. LuggageOnline.com rates the Titan brand in general, based on user comments.