The survey was commissioner by parcel delivery courier CouriersPlease.
The survey found that 56% said they spent more in an online store compared to in-store shopping. Twenty-three percent spent about the same amount.
But online returns were an issue, with 30% saying that returning merchandise was the biggest headache they faced while shopping online.
As one looked at the older age groups, that figure decreased: it was 53% for those in their 40s and 39% for those over 50.
Only 21% of the adults surveyed spent more in a bricks and mortar store compared to an online store.
The main reason advanced for shopping more was the degree of choice (19%) and this was highest for those in their 30s (26%).
The rate of returns, however, was high with 64% having sent back purchases, with the figure being higher (74%) for those in their 20s compared to 57% for those over 50.
CouriersPlease chief operating officer Hoy Yen Hooper commented: “With online shopping now the norm, our survey results show retailers are tapping into consumer preferences and improving the online customer experience.
"However, consumer expectations around delivery and returns are changing, and retailers need to keep up with these preferences to be able to offer a high-quality, full-circle service that also includes a reliable and seamless process for shoppers to return unwanted and unsuitable goods."