I use a pair of BCA Scepter 4S poles - https://backcountryaccess.com/en-gb/p/scepter-4s-poles-19-20
The baskets have cut-outs that are supposed to hold the poles together when collapsed. They are a bit crap though and don't really work.
I'm a splitboarder so I'll often collapse the poles and attach them to my backpack while transitioning. I don't want bits of pole flapping about while I'm riding so it annoys me that it's not easier to secure them together.
If I'm with a slower group then I'll use a ski strap on each pole to hold them together but this is an annoying bit of extra faff! There must be a better to solution that I'm too dim to have thought of...