Soda vending machines come in all shapes and sizes but most common style are stand-alone full sized machines. Soda vending machines have lots of capacity. Even my old one that I paid too much for had a capacity of over 500 cans with 7 total selections. That's a lot of soda which also means that it could be possible that you don't have to visit a location too often if you are looking to vending as a part-time business.
The large capacity of these machines coupled with reasonable product costs and retail price can produce a decent business with healthy margins. I was paying an average of $.40 for a can of soda (tax and deposit included) and retailing that same can for $1.00. So with a $.60 margin multiplied by 5 machines each selling 200 cans of soda a month = a pretty nice little monthly return that doesn't require a lot of work because machines have lots of capacity!
In theory at least.
Here is what else I learned about soda vending machines...
All soda machines plug into a wall because that's how compressor works to keep soda cold.
Older machines may not be multi-price! They may have a coin mechanism inside machine but that doesn't mean that you can change price of your product easily. If you insist on starting your vending business by dealing with Rip-off Bizop Vending Company because they give you location with your machine, ask salesguy to show you how to change price of your soda machine.
Newer soda vending machines can sell bottled product that is either glass bottles or plastic. The glass bottles don't break.
Soda vending machines that allow you to change price of any selection is way to go. A can of pop where I live sells for $1.25 and bottle of juice will sell for $1.65 and up and both can be sold side by side out of a vending machine.