Check out my take on the Legion here . . .
"Injustice anywhere is a threat to justice everywhere."
Martin Luther King Jr., Letter from Birmingham Jail, April 16, 1963
Putting them sideways inside a magazine box does seem to be a pretty good solution. It does men they will be lying on their spine, which could theoretically cause some problems long term, but if someone had a significant number of these, a magazine box dedicated just to treasuries could work well. I don't think I can fit more than 2 inside a box that is actually storing magazines, though.
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If I had just one or two tabloid size editions, I would probably put them in a drawer flat or stand them up between two oversize books on a book shelf. Since I have so many DC Limited Collectors' Editions (as well as a few Marvel Treasury Editions), I now keep them in a file box, laying flat. Some years ago, I discovered that you can get Life magazine bags that fit the tabloid editions. so I use these for most of the books--although this is just regular plastic and not some special polymer, so I don't know how well it keeps the comics (my understanding is that plastic releases gases over time which can contribute to the degradation of the paper). All of this is kind of closing the barn door after the horse has bolted, since for many years I kept most of my tabloid editions in the brown cardboard mailers they came in, which protected them from the elements but probably made the paper age more. I also keep the Dini/Ross tabloids in the same box, but I found that the paper warped soon after I bought these comics--I don't think there's anything to be done about that, since it seems DC's fault for using a certain kind of paper that will naturally warp when bound.
I'm proud of having my collection in the shelf! Only buying collected editions has this perk!
The CGC Books and some raws that I hope to upgrade are stored in a small box on the bottom shelf. It doesn't get more pretty or organized than this!
(Mind you, I do not feel this way about my house in general)
When it comes to bagging TPB's and hardcovers I've used mostly magazine size bags but sometimes it leaves extra space on the sides that I find myself having to double fold the sides with tape, if somebody has found another way to bag them please let me know.
I got a ton of comics in long boxes and more often now short boxes, as they are just easier to maneuver around. I've got most bagged and boarded, but i have gone on a ton of my collection to putting 4 issues in order in a silver bag and board or bagging complete mini-series in golden age bags with a silver board. The older stuff is in individual board and bag though.
Thing I did this year that has really helped with the collection is getting some metal/wood shelving units from Lowes, so that you don't have the boxes stacked on top of each other. This one has 5 shelves and you can get 5 boxes on each shelve. The unit rated for a ton of weight, so the comics don't bug it at all. It really makes getting in and out of the boxes quite a bit easier and I wish I would have done it before.