The world is getting bigger, and there are fewer and fewer places for beachwear to be worn.

This means bags have been replaced with the latest fashion trends and fashion-conscious consumers are demanding bigger bags.

But what if the trend for big bags is really about comfort?

Is it worth the investment to invest in a bag that has enough storage to last a month?

What is the best size of a bag for the daily commute?

How about for the weekend getaway?

And what size should you buy for the trip out?ABC News travelled to New Zealand and Australia to find out what makes a bag great and what to look for when shopping for one.