It's a square glass container with an open top, and there's nothing in it currently. By my guess it's about 1 gallon and I don't know if it's been cycled. Obviously I will need a bigger one (based on a cursory glance over the forum, people seem to recommend anywhere between 2 and 5 gallons for a single betta). Based on pet store recommendations I found around the forum, I have done some local research and found an aquarist who seems trustworthy. Hopefully I'll be able to get my bearings by talking to him ^^ My main concern now is that I'm moving house in about a month, so I don't know when would be the best time to transfer the fish to a properly sized tank/cycle/introduce plants/any other long term project.