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I bought this bag from Amazon as a gym bag for my daughter to take (and keep) her gym kit at school. At the price of less than £4 including delivery it seemed like a reasonable bargain, although I am sure big supermarkets offer such things cheaper every so often if you keep your eyes peeled and go to one anyway.
It's a typical, fairly standard gym kit bag, made of nylon and with a drawstrings that could be used to make shoulder straps if somebody wanted to carry it on their back (I have seen kids do that).
The sack comes in a huge range of colours which is a big advantage for tween girls and other people for whom such things matter, but even for normal people, the choice of colours means that you can buy one in a unique colour so it will be easier to tell apart from others at school (in school shops such bags usually come in couple of colours like blue and black). Also, fairly virulent shades are available for people who want high visibility for a bike for example. Ours is Kelly Green and a very nice, bright colour it is. There are at least seven shades of green, numerous variations of blue and so on. What I also like about the design is that there is no logo, writing or corporate message of any kind, just straightforward plain colours.
The bag is made of strong nylon. It really is fairly sturdy item, not only the material is quite thick but the drawstring tunnel is double stitched and the corners where the drawstrings knots are fastened are reinforced with not only metal eyelets but also sawn-on triangles of fake leather. The seams are double-stitched too, and taped over. My daughter had this as a gym sack for at least two years and it shows none whatsoever signs of wear.
These bags are advertised as water-resistant and this can be a little misleading. The material might be water-resistant but only in the sense of repelling an odd drizzle. It will not keep your gym kit (nor anything else) dry in the rain and it is not suitable for carrying wet kit like swimming suits after use, even if they are spin-dried. You will still need a plastic bag for that.
The BagBase gym sack is approximately 45x34cm (17x13 inches) and flat-sawn, which should easily fit a basic gym kit, especially for a child (top, bottoms, shoes, maybe even a sweatshirt). It is NOT large enough to fit a large towel as well (although it might work if you just wear the shoes) and this is the main reason why I would not recommend it as an adult bag for going to the gym or pool (although men, who I think tend to use smaller towels, might find it sufficient).
For what it is, the Bag Base gym sack is a real bargain, and I would highly recommend it to anybody. They are available from Amazon for prices that vary between £1.25 and £5 (most colours are either £2 or £3, the £5 ones have a contrasting stripe) and delivery of £1.10, which I consider a great price for a sturdy, quality item that should work for years.