We use bags, although at one time DH's family used buckets, and did use a pipeline for a couple of years.
Problem with buckets (uncovered) is when it rains, you either toss or boil a LOOOOONG time. Problem with bags (we don't reuse ours - cleaning & drying enough so it doesn't mold inside is a pain), is the critters that like to chew on the bags, especially near the bottom corners. We KNOW red squirrels chew, and we have seen crows/ravens picking at bags, but don't know if they started it or are finishing it. One especially bad year, we replaced 50 bags EVERY DAY!
We will occasionally use duct tape to reinforce the bottom corners, however have learned NOT to use grey duct tape, it drives the red squirrels bonkers, because they think GREY SQUIRRELS have invaded their turf. (I kid you not!)
Issue we had with the pipeline was the deer running in to it and pulling it down.
Plastic milk jugs & 2 liter soda bottle may just combine the best of both worlds, but they take more room to store.
We use an old milk strainer with a 6" or 7" milk filter to pre-strain at collection (mainly the odd moth). Syrup once at the right temp gets filtered again through the wool funnel filter before reheating to bottle & seal.
We had a lot of sugar sand this year, too, up from last year, & way more than a decade ago. I think it is because where we are is getting less snow in the winter, less rain in the summer. This past sap season we never had to wade through snow...could do it all in hiking boots.