I bought it to spray the herbicide of company parking lot. Until now I used a 5 liter type thing, but I had to make the chemical solution many times before the spraying was over, but as the capacity is high, the number of making it is fewer. Although it became anxious from before purchase, truly 15 liters of water is quite heavy. It is necessary to put it on the ground when carrying it on the back, and it may become forceful to break the balance. After placing it on a table with a height of about the waist, it is easy to carry on the back. Air hole is open at the lid (it is not directly connected because the packing is attached), so be careful when spilling the school bag obliquely, spilling chemical from the air hole.