如果你想翻译“这个书包”这句话的话，你可以说：
"This bag is a backpack."
或者：
"This is a backpack."
如果你想描述书包的具体特征或者用途，你可以加入更多的信息。例如：
"This backpack is made of durable nylon and has padded shoulder straps for comfortable carrying. It's perfect for school, work, or travel."
或者：
"This stypsh backpack has a sleek design and multiple compartments for organizing all of your essentials. It's perfect for daily commuting or weekend adventures."
希望这些信息对你有帮助！
"This bag is a backpack."
或者：
"This is a backpack."
如果你想描述书包的具体特征或者用途，你可以加入更多的信息。例如：
"This backpack is made of durable nylon and has padded shoulder straps for comfortable carrying. It's perfect for school, work, or travel."
或者：
"This stypsh backpack has a sleek design and multiple compartments for organizing all of your essentials. It's perfect for daily commuting or weekend adventures."
希望这些信息对你有帮助！