Moving cities domestically

Next week I’m moving to a new apartment in another city, I have 7 boxes to send, 5 of them are 38x25x25cm, and two big ones with my monitors. I was thinking of using Posti, but my boxes are only half of what a Posti approved L size box can be in terms of height so it feels like a big waste. I’ve also heard of Matkahuolto but the reviews on it are mixed. Can anyone share their experience?