This bag features a roll-up design with metal buckles for secure fastening, allowing for flexible capacity adjustment to suit different loads. The metal buckles and zippers of this bag are made of practical hardware, which is not easily deformed even after repeated opening and closing; the practical anti-slip treatment on the bottom further extends the backpack's lifespan. This backpack is capable of easily carrying a computer for commuting or changing clothes for short trips. Meet your usage needs in different scenarios..syi