Alright, I need to get this off my chest first of all: It really bugs me that this was just labeled a "transgender blogging challenge" and then suddenly there's a question that's mostly oriented toward trans men and trans masculine people. So while the original question was "What’s your binding choice and why?" I'm going to change it to:
What are some of your choices of trans-related garments and items?
Which includes binding but also other stuff.
Anyway, my choice of binder is an Underworks Tri-Top Chest Binder. These are around $30 each and only compress the top. I used to wear the Underworks 997 (I think that's this one, they've changed some things around), which also compresses the belly a bit. I'm less self-conscious about that now and so I only do the chest. I always get them in black. I don't understand why people get them in white because they stain very easily and are hard to get clean.
Currently I have two newer ones. I always break them in before I wear them regularly... and how I do that really goes against the instructions because it's technically destroying them a bit. I wash them with hot water a few times and throw them in the dryer. Then I wear them for short periods of time before they finally get comfortable and I can wear them to, say, work.
I first tried binding when I was maybe 14. With duct tape. Don't do it. Don't do ACE bandages, either.
My very first real binder as a trans man was actually a girdle bottom that I flipped upside down and cut a hole in the crotch of. It worked... OK. An Underworks binder was the first thing I ever bought with a debit card, as an aside.
Right now a binder is the only serious trans garment or item I use regularly. I own a few packers and some STPs. Honestly? I only use STPs when camping or I know there'll be gross bathrooms now. I don't have the same hangups about pissing sitting down that I did early on. Meh. They're really not worth the trouble of lugging around, especially since the only ones I can actually get to work are ones like the Freshette, which are huge and bulky. I own a Mr. Fenis but I have yet to actually get it to work.
I don't pack anymore, either, like I just said. With some pants it looks weird if you aren't packing... like there's some concave pit there (which I guess there is).
So, yeah. That's about it.