Collection: Royal Mail Large Letter Sized Packaging - PIP (Pricing in Proportion)

Everything in this collection is sized to fit within the Royal Mail Large Letter format, maximum 353 x 250 x 25mm, so you can post lightweight items through the cheaper large letter rate instead of a parcel service. Parcelsend stocks these mailing bags, padded mailers and boxes in the UK for same-day despatch. See our Royal Mail Small Parcel sized packaging if your item needs more depth.

How to choose the right Large Letter packaging

The key measurement is depth: Royal Mail Large Letter allows a maximum of 353 x 250 x 25mm and up to 750g, so anything you pack must stay flat enough to fit that 25mm limit once sealed.

Flat and low-profile items

Documents, small clothing items, cards and thin flat goods are natural fits for this format, particularly in a padded mailer for light cushioning.

Checking your packed depth

Always measure your item once it's packed, not before, as padding and sealing can push a parcel over the 25mm limit and into a more expensive rate.

Why order Large Letter packaging from Parcelsend UK

These stock lines are held in the UK and despatched same-day before our daily cut-off, with volume pricing for regular senders and free UK delivery over £100. Browse our wider padded envelopes and mailers range or step up to mailing boxes and cartons for bulkier items.

Key takeaways

• Royal Mail Large Letter allows a maximum size of 353 x 250 x 25mm, up to 750g.
• Always check your packed depth, not the empty packaging depth.
• Padded mailers and slim boxes in this collection are built to stay within that limit.
• All lines are UK-stocked for same-day despatch before the daily cut-off.
• Volume pricing is available, with free delivery on UK orders over £100.