Bring your own condoms, of course. What's the proper etiquette for presenting your own condoms? I'm a bit on the large side and don't fit into a standard condom that well. Many times, ladies don't carry magnums or anything so I bring my own. I've always felt a little weird just plunking them down on the night stand right away. But then right before the act sometimes comes as a surprise. Reactions to this have ranged from, "Cool" to "Why" to "How do I know you didn't poke holes in this." Hey, I'm large not a sociopath. What do you think?

...I would think most would be better prepared. I carry all kinds of sizes for small to average to very large, different textures and brands, latex and non-latex (polyisoprene & polyurethane) etc.
After you've gotten a bit comfortable with them (in session) best you can do is ease into "hey I'm on the larger side down there do you have something that can accommodate that?". I can't be the only lady seeing men of varying sizes "down there" so I don't get why they wouldn't be better prepared in case one comes along. I'd be more surprised if they brought in a brand/texture/size I didn't already have.

In any case, be sure that you bring them in a sealed container to allay their fears of guys poking holes in them, etc.

Before excusing myself to go wash my hands & giving her opportunity to inspect.  I've been told "I have them."  I just said I liked this kind."  But your reason is valid...  in fact a good idea.  Just remember, she always has the right to refuse to use covers provided by someone else.  For the few bucks, it's better to have them & not need them, than to spoil a meeting for lack of them (or enough, if they need to be replaced for some reason).
HV