I bought a small metal tin a few months before I first started doing at-home shots, and that's what I ended up using. I wasn't entirely sure what I was going to do with the tin when I bought it since it was too small for my mass of first aid supplies, but I really liked the thing (it's a vintage art deco first aid tin; I'm a total sucker for art deco

) so I bought it anyway. I was extremely pleased when I found out it was the perfect size for all of my supplies!
The tin is 7.5x5", and about 1.5" tall. It fits the vial of T (in its box), 6 syringes, 6 needles, and a nice stack of alcohol wipes and bandaids. I also keep all the prescription documentation at the bottom. It could probably fit a little bit more, too. The sharps container is obviously too big to fit in there, so I just keep it in its box and keep the two items together. It works out perfectly, so if you could find a box of a similar size, I would highly recommend it.