Avenir Waterproof Bar Bag - Grey/Black - 3 Litre

I recommend this product

Nice bag, fixing bracket is adequate given capacity, closing system is nice and can operate one-handed whilst riding, detaches easily.
However, my bag has leaked after a couple of hours in heavy rain - wouldn't trust it overnight in wet conditions if it contained electronics. Appears to leak through the lid, on the sides.
Still happy with it overall as is generally waterproof and good value especially with map case.
This bag is significantly smaller than, for example, the ortlieb bar bag.