Please read my profile before purchasing. I will not answer questions if you haven't read the profile and description. There are some stains, but they are not very noticeable, so I think you can still use it without any problems. I think I used it for about 1-2 months. After that, it was stored at home. Since it is used and stored at home, please only purchase if you understand the smell and folding wrinkles. Please refrain from purchasing if you are not tolerant of minor oversights or if you are overly concerned about details! I don't know how many liters it is, so please judge from the measurement images. I am a novice, so I don't think the measurements are accurate, so please consider it as a rough size. The gusset is about 15 cm. How about for commuting to work or school? Also good for sports! Also, please consider this if you are looking for items from brands like high school students, Puma, Nike, Mizuno, and Umbro. It will be simply packaged, so please only purchase if you understand. I will fold it to make it compact for packaging, so please be aware of this. Instant purchase OK.