{"niche":"哪款带硬壳、带轮的背包能在功能与价格之间取得最佳平衡？","description":"Which hard-sided wheeled backpack offers the best combination of features and price?","products":[{"brand":"TUMI","model":"International 2 Wheeled Duffel Backpack Carry-On (Style: 1466291041 / TU-146629-1041)","price_gbp":569.8,"origin_country":null,"specs":{"weight":"3.308kg","capacity":"40L","material":"Ballistic Nylon","dimensions":"55 cm X 35.5 cm X 23 cm","number_of_wheels":"2"},"confidence_score":null,"sources":[{"label":"TUMI Singapore","url":"https://www.tumi.sg/tumi/alpha-bravo/international-2-wheel-duffel-backpack-carry-on/tu-146629-1041.html","currency":"USD","source_country":"US","price":1210.0,"price_gbp":919.27,"scraped_at":"2026-06-26T06:19:49.732562"},{"label":"Bergman Luggage","url":"https://www.bergmanluggage.com/products/tumi-alpha-bravo-international-2-wheeled-duffel-backpack-carry-on","currency":"USD","source_country":"US","price":795.0,"price_gbp":603.99,"scraped_at":"2026-06-26T06:19:49.732562"},{"label":"ShopLeatherWorld","url":"https://shopleatherworld.com/products/tumi-0146629","currency":"USD","source_country":"US","price":750.0,"price_gbp":569.8,"scraped_at":"2026-06-26T06:19:49.732562"},{"label":"TUMI Singapore","url":"https://www.tumi.sg/tumi/alpha-bravo/international-2-wheel-duffel-backpack-carry-on/tu-146629-1041.html","currency":"USD","source_country":"US","price":1210.0,"price_gbp":919.27,"scraped_at":"2026-06-26T06:19:52.599159"},{"label":"Bergman Luggage","url":"https://www.bergmanluggage.com/products/tumi-alpha-bravo-international-2-wheeled-duffel-backpack-carry-on","currency":"USD","source_country":"US","price":795.0,"price_gbp":603.99,"scraped_at":"2026-06-26T06:19:52.599159"},{"label":"ShopLeatherWorld","url":"https://shopleatherworld.com/products/tumi-0146629","currency":"USD","source_country":"US","price":750.0,"price_gbp":569.8,"scraped_at":"2026-06-26T06:19:52.599159"}],"summary":"A compact carry-on that converts into a backpack, with a duffel-style opening for packing convenience. It has an expandable capability and a retractable back panel to cover the wheels when worn as a backpack. Suitable for travelers who want a flexible, carry-on sized bag for short trips or business travel.","ideal_for":"It's a 2-wheeled carry-on backpack with 40L capacity, 55 cm X 35.5 cm X 23 cm dimensions, and 3.308kg weight made from ballistic nylon, offering strong specs and a $795 USD price at Bergman Luggage."}]}