I stopped buying any bags/boxes described as "electrician's" years ago when I realised that they are either unsuitable or overpriced because they're targeted at electricians.
For the last six years I've been using a carpenter's/kitchen fitter's bag which is Howden's own brand. It's far better quality than any of the electricians bags I've seen and that includes the ridiculously high priced ones. The perimeter has more than enough pockets and loop for drivers, strippers etc etc. In the middle goes everything else because while there are dividers I don't need them.
They're designed to hold hammers, drivers, chisels, drill bits etc so they cope very well. When you consider that the tools an electrician uses are no different in the main than a chippy there's no reason to spend £150 - £200 on a bag because it says "electrician" in the description. I have a better quality product for £40:00.