Oli, if I were you I'd widen my search. Look for small bags that were originally designed for compact cameras etc. Makers to look out for are e.g. LowePro, Tenba, Tamrac and Domke. But there are many others. Many of these bags, like those made by LowePro and Tenba, are very high quality. If there's still a camera shop near where you live, it might pay to go there, take the binoculars and have a look. I bought a lot of small bags and cases over the years, many of them at reduced prices. You can never have too many small bags ...

I sometimes struck gold and found old Leica and Zeiss leather bags at ridiculously low prices.
By the way, it would be nice if you could write a review of the Nikon. There are three on the forum, but it would be nice to have a few more. And up to now not many people seem to have handled the 10x25S. Doesn't need to be a technical review, just your impressions, ideally in comparison to other binoculars you know.
Hermann