Bargain Arc Haul Ultra 60L Backpack - Lightweight Hiking Pack Without Belt/Straps in Dusk Blue - Medium Torso Size for Outdoor Adventures & Travel" 或 "Ultra Lightweight 60L Hiking Backpack by Bargain Arc - No Belt/No Straps Design in Dusk Blue - Medium Torso Fit for Camping, Trekking & Travel Gear" （根据SEO优化，关键词如"lightweight hiking backpack"、"no belt design"等更易被搜索到，同时加入使用场景如camping/trekking提升相关性。）