I've been using a packy from Mango (I ordered it before things got really bad over there) and got a backup from Toys in Babeland. They seem to be identical--made of that gel material, and very, very PINK. I like extra small; I have a small but don't like it.
But I just ordered a Good Vibes; we'll see how that goes.
I use TranzWear and really like it. They're a bit pricey, but I often see odds and ends in the clearance section. Also, you get a discount if you order a three-pack.
I never thought I would be able to pack because I'm allergic to practically everything under the sun that people use for harnesses. So I was glad to spend the money on TranzWear. The boxer briefs have covered elastic, so my skin isn't irritated.
I'm thinking that one TW model would be appropriate for an STP device, but I haven't gotten around to getting an STP yet. I like the devices I saw on an Oz site that somebody already mentioned--Home Grown. Does anyone have experience with their STPs?