Great question — answering as the UphillTech team:
I suspect the part you've shown is specific to one manufacturer, but direct equivalents might exist. However they'd be hard to find. Here are a couple of similar systems I've seen. This one is from a LowePro camera backpack, used to carry a tripod. That's similar in terms of attachment to trekking poles, but a fair bit heavier. It uses a separate clip and adjuster. and removed from the bag: This gives you the quick release of the clip, while using the adjuster to set the length/tension. The adjuster is merely the spring type, and needs to be quite a decent one to have enough holding force. But it works well. You could substitute other forms of cord adjuster. For this second idea, I didn't...
Full answer by Chris H: https://outdoors.stackexchange.com/a/29291 (CC BY-SA 4.0).
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