As is the usual way of things, it’s no surprise that with carry choices, no one solution suits everyone - or even suits one person in all situations.
And in terms of possibilities, there’s two main choices discussed above:
• the convenience of a single strap (either around the neck or diagonally across the body bandoleer style), verses;
• the off-the-neck comfort and stability of a full harness/ full pouch combo.
However, there’s also a couple of intermediate possibilities, using a slip on/ off elastic edged 'shower cap' style cover, that's held around the torso by an attached elastic strap. Either:
a) the shower cap/ elastic strap used with a seperate neck strap or harness, or;
b) the shower cap/ elastic strap with an integral harness.
Neither of these approaches ever seem to really take off. Every few years or so they're 'rediscovered' and then offered by a small company for a while.
For a current example of a), see an image of the Alpine Innovations Bino Slicker NX Cover & Control Band. There’s also an upmarket version by Swazi, that as shown was briefly offered by Leica.
For a current example of b), see two images of the AI Bino Slicker XD Harness (and interestingly the concept is covered in two patents US6926184B2 and US6983870B2 lodged in 2003, see an image from the first).
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My default is a neck strap adjusted so that the binocular is worn high on my chest (the strap is so short that it barely fits over my head),
which minimises swing and bounce.
And with heavier binoculars, a wide neck strap contoured to lay flat at the back of the neck significantly adds to comfort.
With my EL 12x50 I often add a version of a). The key point is that as the binocular is worn high, the cover/ elastic strap is also high around my chest
(this is in contrast to most images that show a binocular worn much lower, with the strap around the abdomen).
A significant advantage of the high carry is that the elastic strap can be adjusted to comfortably support at least 2/3 the weight of the binocular, and so a simple neck strap works fine.
. . . so another possibility to consider.
John