ak47xlowlife...5l pot?

hey guys gunna start my lowlife ak47 soon...it says for best results start in 5l pot..i just bought 2.8 wats the deal should i stay with the little pots then trnsplants or juss go with the 5s?

most people growing lowryder hybrids use a 2 gallon pot which would be 6.8 liters or so. you can start them im sure in a 2.8 liter pot but will probably need to transplant before alls said and done

whats the worst that could happen if i kept them in a 4.7l pot and how would watering be? i wanna start them in thosse?or should i start in beer cups then transplant?