Currently I am using one from Aldi , 8" long, 5.5" tall and 5.5" from back to front.
It had a detachable lower part which I gave away to a friend. This item is well padded and has a compartment for extra cards , batteries etc. It has a robust padded handle and a shoulder strap is provided.
Cost was about £8 at the time.
At that time I got one or two extras for prizes at our stalkers shoots but they have all gone now and none have been in stock at Aldi since then.
HWH.