Here is a great alternative to those bulky binocular harnesses. Approximate cost is less than $5.
6-7’: 1/8” shock chord (bungee chord)
2pcs: Size #1 Barrel Swivel.
2pcs: Split Rings (aka Keychain rings).
2pcs: Small Zip Ties
Step 1 – Add the swivels to the chord
Step 2: Tie tag ends together with an overhand knot.
Step 3: Create 2 loops and tie off with an overhand knot. (Make sure you have a swivel in each loop)
Step 4: Attach to binoculars using the split rings (keychain rings) and zip ties.
Step 5 – Try them on for size. You can adjust the size of the harness by moving or adding to your overhand knot