Containers of coins, obviously. This wordplay is so natural that it doesn’t need even a subtle hint to be fully understood. It defines places where people keep their money. No more, no less.
Funds, ICOs, lotteries, credits, money exchange services – these are just the few applications for this domain name that come to mind immediatly.
Because of its plural form, it could be ideal for an aggregator type service. In this area domain name Cointainers.com has no real competition, with the exception of one word keys. And not even every such key would have the same marketing and brand value since it has fresh, unique flavour to it.
This brilliant domain name is on sale right now!