Whether the backpack of 700 yuan is expensive or not depends on the brand, material, design, function and manufacturing quality. 700 yuan backpack is a reasonable price for some famous brands or high-end designer brands. These brands pay attention to the use of high-quality materials and unique designs, and the manufacturing process is more refined. 700 yuan is relatively high for other ordinary brands or ordinary quality backpacks. So whether the backpack of 700 is expensive or not depends on its brand, material, design and its actual consumption.