World's most advanced modular 4-wheel spinner! Zip apart to fit in tight airplane spaces - never check a bag! Patented 3-bags-in-1 design: Expandable Spinner - With 360° wheels and side pockets. Weekender Daypack - Ideal for quick trips or as your personal item. Expandable Tote Pack - Multiple modes of carry; everyday or for travel. Converts to a rolling bag or travel backpack. All Three Bags are Expandable! All 3 bags can be used separately, or together - mix and match!