Product Guide

The Best Products to Send in Letterbox-Friendly Packaging

Which products fit letterbox packaging perfectly and save you money on every shipment.

3 min readUpdated April 2025

Ideal products for letterbox delivery

Any product that is flat, thin, and under 750g is a candidate for letterbox packaging. The critical constraint is the 25mm thickness limit (including packaging). Products that naturally fit this profile save significant postage costs and enjoy guaranteed first-time delivery.

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Jewellery and small accessories - earrings, necklaces, bracelets, hair clips
Phone cases and tech accessories - screen protectors, cables, memory cards
Skincare and cosmetic samples - sheet masks, sachets, thin tubes
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Stationery and prints - cards, notebooks, art prints, stickers

Quick answer

Jewellery, phone cases, cosmetics, stationery, seeds, tea samples, subscription samples, thin books, and small accessories all ship perfectly in letterbox boxes. The key requirement is under 25mm total thickness when packed. Many subscription businesses design their entire product range around letterbox compatibility to maximise shipping savings and guarantee delivery without the customer being home.

Product categories

Letterbox-compatible products0 / 8 checked

Jewellery: earrings, necklaces, bracelets, brooches, rings
Tech accessories: phone cases, screen protectors, cables, adapters
Cosmetics: samples, sheet masks, lip products, single-use sachets
Stationery: greeting cards, notebooks, art prints, planners
Seeds and garden items: seed packets, small plant markers
Tea and coffee samples: tea bags, coffee sachets, sample packs
Subscription boxes: curated sample collections, monthly surprises
Documents: certificates, photographs, small books, comics

Shipping savings: cost reduction guide or subscription packaging.

Adapting products to fit

Some products can be adapted to fit letterbox dimensions with creative packaging. Flat-fold clothing items, vacuum-sealed soft goods, and products repackaged from bulky retail boxes into slim custom packaging can all qualify for letterbox delivery.

What does not fit

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Bottles and tubes over 20mm diameter push beyond the thickness limit
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Fragile 3D items needing cushioning on all sides exceed 25mm when properly packed
Items over 750g exceed the weight limit even if dimensions fit
From ProcuraPack

Letterbox boxes for your products

Find the perfect letterbox box size for your product range at ProcuraPack.

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Frequently asked questions

Jewellery, phone cases, cosmetics, stationery, seeds, tea samples, and any flat item under 25mm thick.

Thin items like t-shirts can be flat-folded to fit. Bulkier clothing generally exceeds the thickness limit.

Many are designed specifically for letterbox delivery, with curated thin products that fit within limits.

Sometimes - repackaging from bulky retail boxes into slim custom packaging can make products letterbox-compatible.

750g including product and packaging for Royal Mail large letter classification.

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Shipping SavingsSubscription BoxesSizing GuideLetterbox vs Postal

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