Baggallini pioneered featherweight nylon bags, and its

Downtown Bagg

is likely to become a favorite.

Weighing less than one pound, the 12-inch-by-11-inch-by-3.5-inch-thick crinkle nylon bag converts from a backpack to a side-hugging sling shoulder bag.

Unzip the bag's main compartment, and you'll find a spacious interior with a gusseted cell-phone pocket, credit-card compartments, a key fob, and a detachable ID coin purse with a built-in mirror.

Outside, two side pockets and a front pocket, all zippered, make for easy access to frequently used items. When empty, the bag is nearly flat.

One quibble: The back straps are not adjustable, so the bag could hang uncomfortably low for smaller users.

Available in eight color combinations. Baggallini Downtown Bagg is $69.99 at www.ebags.com; 1-800-820-6126

- Judi Dash