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I brought one of these bags for my son, for him to use as his school bag. It is very spacious and has a big, zipped front pocket, which he keeps his bus money and door keys in. It is light weight and the strap is adjustable so it can suit ages from school age to an adult. It is quite hard wearing, (as my son often scrapes it along the floor and chucks it down). It is good value for money. I think it is more suited for either a school bag or an overnight bag, but you wouldn't be able to fit a weeks worth of clothes in. My son manages to fit his school books, lunch box, water bottle and usually a thick winter jacket in it.
The only disadvantage I would point out is that there isn't any padding on the shoulder strap, however it is like a soft leather feel, so it doesn't dig in, even with quite a bit of weight in it.
It looks quite smart with the white piping, but it also has a sports logo, making it very trendy and versatile for the different range of ages.
The zips are easy to use and don't get stuck, they also have circular zips which is easy to grip and also have a logo on them. They are also strong zips that can with hold a hard tug.
Overall I would definitely recommend this bag to suit all ages and can even be used for both genders.