I purchased this product to decorate cakes, cheesecakes, tartes, cupcakes, fill cannelloni, profiteroles, etc.
It's made of cotton fabric, with a very strong seam and it has a sort of plastic backing to it that makes the fillings slide easily and it cleans really easily too in warm soapy water.
The product came with some tips that I found okay but not great for starting with. They could have included some tips with larger openings for filling cannelloni more easily or for making petals for example.
The bag itself is of great quality, I've used it a few times and it still looks like new.
I would not wash this bag with hot water, because it would probably damage the seam and would deform the plastic backing that is applied to the fabric.
There is a standard coupler with this product, so you can change tips without having to empty the bag, and this is pretty handy.
I found that the size is pretty good, it holds a fair amount of filling and you can easily decorate a 7" cake with it if you put enough filling in.
If you're a beginner in decoration, I'd certainly recommend this product. There's absolutely no need to buy something more robust in quality if you're not going to use it for hours every day of the week. Even if this product perished quickly, which in my experience haven't happened, you could easily spend another £5 and buy another one.
There's no reason why a cook should not have one of these in the kitchen, they aren't only useful for decorating cakes, you can pipe cream into sweets like doughnuts and profiteroles, you can fill round pasta like cannelloni with it, you can pipe savoury mixtures into tartlet moulds and whatnot... it's really affordable and you'll be pleased with it.
I hope this helped.