Letterbox

SL3 Letterbox

340 x 245 x 22 mm
Out of stock
Look no further for a large letter box, the SL3 ensures the cheapest postal tariff every time. Maximising the large letter size limit and reducing your postal costs, these boxes are perfect for t-shirts and other fashion items, A4 sized magazines, documents, photograpics and artwork. This large letter mail box 13.4" x 9.6" x 0.8" is fantastic! The strong corrugated, single wall design is doormat friendly, with a hinged lid and secure side lock. Our hot melt adhesive gives you the best seal. 'Thank you for shopping with us' is printed as standard. For assembly instructions - please click here.
1-9 £1.536 each (ex vat)
  • Weight97g
  • Qty box80
  • Qty pallet3200
  • 10+ £1.059 save 31%
  • 25+ £1.021 save 34%
  • 50+ £0.992 save 35%
  • 100+ £0.963 save 37%
  • 200+ £0.683 save 56%
  • 500+ £0.609 save 60%
  • 1000+ £0.530 save 65%
  • 2000+ £0.424 save 72%
  • 5000+ £0.409 save 73%
  • 10000+ £0.395 save 74%

Looking for a large letter box to maximise the Royal Mail large letter size limit of 353 x 250 x 25mm? This large letter mail box is the ultimate letterbox-ready packaging option. Our research tells us that almost 95% of UK letterboxes are at least 254mm (10 inches) wide and 38mm (1.5 inches) high. This means the SL3 will 100% fit the low cost Royal Mail Large Letter tariff AND fit 95% of UK Letterboxes benefitting far fewer 'failed deliveries', and even more happy customers! Perfect for t-shirts and other fashion items, A4 sized magazines, documents, photograpics and artwork. This large letter postal box features our market-leading hot melt peel'n'seal / red-tear-strip combination, thick and strong corrugated cardboard material, and 100% green recyclable credentials. Beware of pale imitations and cheap, 'clipfast-tray' style A4 packaging size boxes.

Royal Mail Large Letter box maximiser for cheap postal tariff mailings.

This large letter box fits through most standard size UK letterboxes, click here to read our blog... 

The strong design of this large letter mail box is doormat friendly.

Hinged lid for extra wow factor, with secure seal. Hot melt adhesive gives the best, tight seal - at least twice the strength of standard double-sided tape.

Environmentally friendly, 100% recyclable.

Problems with storage? At Lil packaging, we hold vast quantities of Lil letterboxes in stock for your convenience.


Your packaging is the first time that your customers physically experience your product. Getting it right is your chance to make the best first impression. We help you do just that.

With a clear understanding of what you need, we use our knowledge and expertise to guide you to the most appropriate solutions. It's about unrivalled service. Over 98% of our orders are dispatched within 24 hours. Getting valuable products safely to your customers without compromising on costs wasn't easy, until now...

Color Brown Corrugated
Flap Type Hotmelt Peel & Seal with red rip strip opening
Height 22
Internal Width MM 340
Width (mm) 301 - 400
Internal Length MM 245
Length (mm) 201 - 300
Internal Height MM 22
Height (mm) 0 - 100
Internal Width Inches 13.4
Internal Length Inches 9.6
Internal Height Inches .8
Item Weight (g) 97
Quantity per Box/Pack 80
Quantity per pallet 3200
Width 340
  • 100% recyclable

  • easy open tear strip

  • fits large letter

  • fits letterbox

  • FSC® certified products

  • peel 'n' seal

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