Double-Stacking Luggage Set. Mix & Match Any 2x Deluxe Birdy Luggage & Accessory Sets. Either Birdy can be stacked on top or bottom. Each luggage sey includes 10x accessories. The Deluxe Birdy Bundle (11 pieces) is our premium carry-on luggage style with smart-tech integration & phone charging capability. The Deluxe Bundle includes Birdy's signature round suitcase plus 10 custom fitted Birdy accessories (listed below) and 20 smart & functional features. The Deluxe Birdy is our enhanced edition with our newest design element: The back-stacking trolley sleeve that allows you to stack a Deluxe Birdy on top of another Deluxe or Essential Birdy giving you the ability to roll with 2 Birdys in one hand. With maximum 9 in. of interior depth, you can pack for 3-5 days. Join the Jetsetter Club Today & Travel Smarter with Birdy!