I was confused about which to get and they are only £3 each from China, so I ordered A, B and D. (They didn't stock C).
So here is where they do and don't differ.
External dimensions (HxWxD in mm):
A 137 x 73 x 47
B 137 x 80 x 50
D 138 x 62 x 43
In other words B is short and fat, D is tall and slim, and A is somewhere in between.
Internal height of the pouch (mm):
A 85
B 76
D 65
Construction:
In A and B, the whole pouch is made of webbing. In D, the front, bottom and back are one piece of curved webbing but the sides are elasticated.
Overclip:
In A and B, the male part of the overclip floats on a piece of shockcord that is secured through 2 eyelets and tied at the back. D is similar, except that the shockcord is secured by being sewn into the structure of the belt loop (when the shockcord perishes it will be a pain to replace, though there is a loop of material that you could tie it through instead).
In B, the female part of the overclip is fixed to the front of the pouch and can be done up one-handed. In A and D, the female part of the overclip floats on a short piece of webbing and is more awkward to do up.
Belt loop:
A is very secure with velcro and 2 poppers. B has velcro and 1 popper. D just has 2 poppers.
Fittings:
A has 2 vertically oriented plastic D-rings at mid-height. D has 2 horizontally oriented plastic D-rings at the top. B has 2 horizontally oriented plastic D-rings at the bottom and 2 horizontally oriented plastic dog clips at the top.
Strap:
A and D come with a single strap that is adjustable from 95cm to 175cm, with plastic dog clips each end. B comes with three 40 to 70 cm adjustable straps hanging off a central metal hoop, with plastic dog-clips at the end of each strap.
An Icom M73 Euro fits in A and B with plenty of room to spare. It also fits comfortably in D but the shockcord is very tight.
A smaller handset like the Baofeng UV-5R is a bit lost in A and B and the PTT switch can't be operated as it's down inside the pouch. It's fine in D.
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