You MUST have duck call lanyards for your duck calls. There is no other way to effectively manage even one or two duck calls in the blind without a lanyard. Your calls will be wet, muddy, stepped on or lost forever before the end of the first hunt without a lanyard. So, get a duck call lanyard for your calls, even if you only plan to use one call for the rest of your life.
Here are the things to consider when setting yourself up with a lanyard.
1. Make sure it's made of good, sturdy material like leather, neoprene or braided cloth rope.
Lanyards made of a single thin string will hold your calls well enough, but they are skinny and limber and will swing back and forth across your chest with every movement. A slightly thicker, stiffer and more sturdy lanyard will stay in place more across your chest for easy, reliable access.
2. Wear only one lanyard if you can get all your calls on it.
Some people take 10 calls to the field and want all of them around their neck at once. I don't advise this because you'll more than likely have a tangled, clattering mess across your chest in no time, but whatever . . . . In that case, you'll need two lanyards probably if you have 10 calls and want to wear them all. But, wear only one at the time and put the other one in the gear bag beside you for quick access in case you need it.
3. Get a large enough lanyard or get an expandable one.
A lanyard that can expand from 1 to 5 calls is a good choice. Even if you plan on never using more than 2 or 3 calls at one time, still get a lanyard that can hold 5 calls. You can store all your calls on the lanyard during the offseason, if nothing else.
4. Consider comfort around your neck.
Most of the materials used to make good lanyards won't rub your neck raw, so that's not the issue, not even down here in Gulf Coast Texas where we begin teal season in 90-degree heat wearing t-shirts. Usually you're hunting with layers of clothes on, so lanyard material comfort is not an issue.
What IS a comfort issue is distribution of weight if you load up your lanyard with a lot of calls. Four hours with a pound or so of duck calls around your neck can start to ache, especially in the cold. So, choose a lanyard that has a wider, rather than a thin neck section, so that it doesn't cut into your neck from the weight of the calls, and so that the weight is distributed across a wider band.
A good duck call lanyard will serve you for years and years. It may seem like a small thing, but a good lanyard makes happy duck hunters!