carrying fence posts for rotational grazing paddocks

We use step-in posts for the electric fence for our cattle paddocks, and I'm trying to come up with a good way to carry all the posts from one paddock to the next. A fence post sized quiver would be good, it seems like! Anyone have good ways to carry all the posts when moving paddocks? I"m probably trying to carry 30 or so, and right now using a canvas sling that is for carrying firewood. It's better than nothing, but still frustrating.

Can you use a golf club bag on a caddy (can get them dirt cheap at garage sales and auctions)? I am trying to figure this out myself, right now only have the net with integrated posts.