I have to admit I print very little of my stuff unless I'm going to exhibit it. But when I do print 6x6 negatives, I generally start with a 5+ inch square as a test print. I stock 11x14 paper which cuts up as four 5.5 inch squares plus some test strips. The ones that go to exhibition then get printed about 10.5 inches square. I have in the past (I've been lazy lately) dry mounted the best of the test prints on individual pages in a ring binder to create a small portfolio. Since family and friends are scattered a bit geographically, I generally scan and place on the web (or burn a CD/DVD) for that function.
Internally the "mini-portfolios" look like:
The print is dry mounted on a piece of mat board in the general style I use for exhibition -- and wouldn't you know, the mat board fits out of the window cut from the larger mats!
The mounted piece is then put on a black page punched for the ring binder. Yes, it's a bit of work, which may explain why I've not done one in a few years! With mat board thickness involved, there is a pretty tight limit on how many can be put in one binder; perhaps not so good for vacation shots.
The small label gives title, film and various details. My original purpose was for occasional self promotion or maybe take one along when out in the field to show anyone questioning my activities.
Since there are many ring binders with a transparent front pocket, one can exercise unlimited creativity in adding a cover:
(Or not!)
If you print 4x4 inches, you could get Printfile pages for 4x5 that have four pockets and could be double loaded to display a total of eight per page.