I have just happened to research 2.2 packs and settled on 2 very cheap packs. Those dimensions look pretty restrictive and the pack dimensions should be checked carefully before purchase. Also I see the plane has a 40 amp esc. I'm not sure what the max or constant current could be on this jet. The pack needs to have enough current capability.

I settled on HobbyKing for 3 of my packs and got 20C 3sx2200 mah. You may find that you need a 40C pack (which are more money) The 22oo size seems very popular and many of them are similar sized.

I'm a noob too, maybe I could get a jet next year when I get more experience.