Whether you're cramming your suitcase into an overhead bin or under your bed, space is at a premium. With that in mind, luggage companies are rolling out innovative space-saving bags. Here's the skinny on three of them.

Biaggi Contempo Foldable Carry-on

Biaggi Contempo This 8.4-pound bag has an expandable main compartment, four wheels for easier handling, and a micro nylon exterior that is both sleek and durable. After unpacking the bag, you can twist an interior dial and collapse the sides for easier storage. During our test, the bag collapsed easily, but the wheels protruded quite a bit. Available in six colors, including purple and turquoise.
Dimensions: 22 in. H x 14 in. W x 11 in. D.
Cost: $229

Road warrior luggage Collapsible Carry-on

Road WarriorWeighing in at 9.5 pounds, this two-wheeled carry-on has a rugged ballistic nylon exterior and a frame made of airplane-grade aluminum. The bag, which comes with a removable garment sleeve, collapses easily: Simply pull two interior ripcords and press down. Another plus? An included storage sleeve has a built-in hook for hanging it in a closet. Available in black and red.
Dimensions: 20 in. H x 16 in. W x 9 in. D
Cost: $329

Briggs & Riley Baseline CX Domestic Carry-on Expandable Upright

Briggs & Riley The 8.9-pound Baseline has adjustable sides that you can expand to increase packing capacity 25 percent. Then, you can close the bag and compress it back down to its original size for storage in an overhead bin. The two-wheeled carry-on, which comes with a removable garment bag, has a fiberglass frame and durable nylon exterior. Available in green and black.
Dimensions: 21 in. H x 14 in. W x 8 in. D
Cost: $449