Having recently got my v1.1 AM in GG round7, I'm really pleased to report that the recessed card and switch, means it fits really well in this case sized 85x58x33mm:
The width is a perfect snug fit, with small fillets of (camping mat) foam for the length in either end of lid, and also on the base.
As was used in the recent British Bat Survey 2019 SW pilot (BBS19) I have used two layers of metal mesh treated with NicWax over the Mic- https://www.inoxia.co.uk/products/mesh/sheets/500-mesh
Pros of this case:
- A proper waterproof compressed rubber seal, mean this is very likely to be fully waterproof case
- Not as cheap as the OBO A8, but at around £1.50 GBP its not expensive
- Four small screens to lose in the field, and screwdriver to carry.
- AMv1.1 only., It is too narrow for a AMv1.0
Overall I think I'll use these case for AM v1.1 in damp, or less secure situations. But if it is a dry and secure site I think I'll stick with the convenience of the OBO A8 case.