We've used: a plastic rope spool (free from West Marine), a canvas stuff bag, and a permanently mounted aluminum reel. The plastic spool worked pretty well, we stuck the boat hook through the hole and supported it from the pulpit at one end and the backside of the steering wheel if I remember correctly. We had 400' of poly
line on it. It worked but was definitely a bit awkward especially for retrieval. The stuff bag, homemade, was about the size of a five gallon bucket, maybe a bit bigger, and we also used poly
line with it. It fed out fine, rarely a tangle, but retrieval was very slow (and once you release the stern
line you are drifting free and so you want to get it into the boat fast because you need to deal with the
anchor asap). We wanted something easy so when we had the rack made for the solar panels we had the fabricator add the reel to the port side of it and it works great. We are using 400' of 5/16' "crab"
line which is a weighted line and very strong and abrasion resistant. I wanted something stronger than poly line, the stern line can come under as much strain as your
anchor line in a side blow so I like a strong line. I would rather have a floating line, but I had thousands of feet of crab line and new it was tough, besides that Erps here on SN said that was what he used, that was good enough for me. With a reel you want the core to be a pretty big diameter so it reels in fast.