Businesses that are looking to stay compliant with Royal Mail’s Pricing in Proportion (PiP) guidelines, but also want to look at keeping their postage costs low, will find great use in the Royal Mail PiP boxes we have on offer at SR Mailing. These Royal Mail boxes are specifically designed to meet the ‘Large Letter’ requirements in a secure and professional package.

Available in a range of standard sizes, including C4, C5, C6, DL and Mini, our Royal Mail PiP boxes are made from durable 100% corrugated cardboard containing 70% recycled material. Fully biodegradable, compostable and recyclable, they’re ideal for any eco-conscious business seeking to reduce their environmental footprint. The boxes arrive flat-packed for convenient storage and can be quickly assembled when needed, perfect for busy fulfilment teams.

Each one of our Royal Mail PiP boxes comes with a highly secure adhesive strip that increases the overall security and will act as a tamper-evident system to give you and your customers extra peace of mind.

The very lightweight yet rigid design ensures your products will remain well protected in the various stages of transit, while also helping you qualify for the lower-cost Large Letter postage rate. Compared to mailing bags, these Royal Mail boxes offer a more professional and presentable packaging solution with enhanced protection against moisture and tearing.

At SR Mailing, we are proud to offer carbon-neutral packaging products that don’t compromise on performance. Our PiP boxes are part of our wider commitment to sustainability, reliability and quality assurance. Businesses in the Manchester area also benefit from next-day store-to-store delivery or same-day store collection, ensuring you never run out of essential supplies.

By choosing SR Mailing’s Royal Mail PiP boxes, you’re investing in cost-effective, compliant and environmentally responsible packaging that supports your brand’s professional image and your sustainability goals.