I'm doing it myself for 22 11 and 12 year olds. Menu requested by DD -
basic ham, cheese and egg sandwiches, mini sausages, tomatoes/cucumber/carrots/peppers with dips etc.
My question is simple but perplexing me. 
I'll be putting crisps out in bowls to be shared.
How many bags shall I take? (The party is not at home. They will only be eating at one specific time, not grazing)
The crisps bags are the sharing ones, 150g size.
TIA