Store-based parcel delivery and returns service CollectPlus is to expand its network by a third over the next year.
The service will increase from 5,500 to 7,500 stores, with a longer term aim of achieving 12,000 outlets.
The news comes as the company prepares to celebrate its fifth birthday, and follows a 25% growth last year off the back of record online retail sales.
Chief executive Neil Ashworth said: "Our philosophy has always been to make life easier for our customers.
Whether a customer is returning, sending or collecting one or several parcels, we want them to have the best possible experience from start to finish.
"We are committed to expanding the CollectPlus network to ensure our unique offering is available wherever our customers are, and in stores that have the capacity and ability to deliver a great service even during busy times.
"We are now providing returns solutions for over 260 retail brands, resulting in an ever-growing and wide-ranging customer base.
"We're extremely proud that as we approach our fifth birthday we are accelerating our network coverage and will be almost two thirds the size of the Post Office this time next year."