this will be awkward writing um
but basically packers are fake dicks (not usually made for sexual purposes) that trans guys use to kind of get a bulge you can see with a good deal of cis guys.
STPs are devices that look like fake dicks that let you stand to pee (which is what STP stands for- Stand To Pee). super handy in public restrooms (:
Some packers, not all, double as STPs.
I wouldn't say they're super important in passing but you know girls don't usually have bulges in their jeans so it does help. It can also be super helpful with dysphoria, so it's pretty nice to get if you have really bad bottom dysphoria (or any at all actually).
If you can't get a packer (which is common, most parents aren't chill with their kids getting them) then rolled up socks work as an okay alternative until one is available.
I don't know for sure, but there might be ways to make a makeshift STP as well. you can look that up if you want more info.
so yeah I hope this was at least a little helpful (:

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Transgender Help Book! (FtM)
RandomIn here I will be giving advice and such to fellow trans people, or giving information to those who are otherwise just curious. Feel free to ask questions about anything, I'll do best to answer and/or make a chapter about it if necessary (: