Expandable checked duffle bag with multilayer expansion and practical mobility Expandable capacity and size options: The bag starts with a dailyuse footprint of 15.7 x 8.6 x 12.6 inches and a base capacity of 25L. By unzipping the bottom expansion, you access a first expansion layer that raises the height to 20 inches, and a second expansion layer that lifts it to 27.56 inches. The overall capacity expands from 25L to a maximum of 55L, allowing you to adjust storage space to fit your trip. Detachable wheels for easy travel: Four detachable 360degree wheels are positioned at the bottom to provide smooth mobility. Wheels can be easily attached or removed to suit your travel needs, helping you move through crowded airports, train stations, or rough streets with less effort. Foldable for easy storage: In addition to its large capacity, the bag can be folded into a compact size for convenient storage when not in use or during transport. Durable, protective materials: Made from durable oxford cloth with a polyester inner lining. The construction is waterproof, tearresistant, and scratchresistant, designed to withstand travel conditions and protect your belongings. Practical use scenarios: Weekend getaways or short trips: start with a compact 25L, expand as needed to accommodate extra outfits or souvenirs. Business travel with variable packing: expand the bag to 55L for additional documents, gear, or wardrobe changes while keeping weight in check. Family trips or longer travel: use the expanded capacity to carry larger items, then collapse as you home. Consistent features and performance: All specifications, dimensions, expansion heights, and material details align with the original design, ensuring reliable use as an expandable checked bag with versatile capacity, mobility, and storage practicality.