Reddit mentions of STYLIO Padfolio/Resume Portfolio Folder - Interview/Legal Document Organizer & Business Card Holder - with Letter-Sized Writing Pad - Handsome Piano Noir Faux Leather Matte Finish & Accent Stitching

I would really like a padfolio, I think. Minnesota’s admittens look cute. I liked Northwestern’s umbrella because I have an uncanny ability to lose umbrellas.

Things that I DON’T want: tshirt or lanyard

Congrats on reaching the final round. I've done a bunch of all day interviews so I'll provide some information from my experience, but note that it is fundamentally anecdotal and related to my industry.

1. Bring something to take notes in, a couple of pens and a good number of resumes (I use a 'portfolio' to hold all of these things similar to this). If your previous work is both public information and easily displayed in paper form, it may be reasonable to bring examples in, but I doubt you will use it.
   
2. Do a little background research on the team members - take a look at the company website and their linkedin profiles. It never hurts to have some idea of what you are getting into. It also can help you when thinking about questions you may have and topics you may want to discuss
   
3. In terms of preparation, outside of researching who you are meeting with, make sure you know the company well, understand their products and structure as best you can and come prepared with questions about the areas you don't understand. I would guess these interviews / meetings will be mostly fit based so make sure you are well rested and ready for potentially a full day of back to back interviews. If you're the kind of person who stresses, try to eat well the day before, get a good night's sleep and prepare your outfit and some water for yourself in the morning.
   
4. Be prepared to field questions about what you are expecting in terms of salary, benefits, etc. This is a mistake I have made. There is a chance they ask you what you expect for salary and they might even offer you the job on the spot. Be prepared with a specific idea of where you want to start salary negotiations. Also, be prepared to give them an idea of how long it will take you to make a decision if they do give you an offer and how long until you could actually start on the job.
   
   I think those are the big pieces of advice I'd give. Again, congrats! Be confident, they wouldn't bring you in and spend a full day on you if they weren't VERY interested so you're probably almost in the job at this point.
   
   Edit: Forgot about your question of which day to go in. I don't think it particularly matters. The one thing I'd say is that Monday's are very busy in some industries and so people may not have as much time to speak with you. I'd probably lean towards Tuesday if I was you, but again, I don't think it really matters.

You might try a folio or padfolio like this.

I'm a designer so I have a portfolio like these.