Growbags in allotments

Hello
Excuse me if I sound ignorant, cos I am. I am wondering if I can use new growbags as compost in a new allotment. I have made raised beds with sleepers and tested the soil which is 6.1.
I am brand new to growing and costed the bags of compost and found the growbags cheapest. Are they suitable? I dont know if they're different to the multi purpose compost

I've moved your post here where you may get more replies, why don't you pop back to the welcome area and introduce yourself  

Grow bag compost is ok to use in your raised beds, but although the individual bags are cheaper there is less compost in them
B & Q and Wickes for example usually do much bigger bags and they're usually on offer with buy three for...... sort of deals....have a good look around

Homebase have an offer on bags of compost 60ltre size 4 for3 and welcome to the forum