LilTM flatpack

F3 Flatpack

352 x 249 mm

Look no further for large letter flatpacks, the Lil F3 flatpack ensures the cheapest postal tariff every time. Maximising the large letter size limit and reducing your postal costs, these large letter cardboard envelopes are perfect for A4 sized brochures and other items. These large letter flatpacks are a seriously strong & professional packaging option for your e-commerce business. Fast to pack, tamper proof protection!


$2.66 each excl GST

2088 in stock

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Unit price (each) exc. GST
WeightQty pallet0- 99100- 399400- 9991000- 17991800- 40494050-


Looking for large letter flatpacks to maximise the Royal Mail large letter size limit of 353 x 250 x 25mm? If you’re using stiffeners, void-fill or airbags in your packaging, there is usually a better way to package what you’re sending. The Lil F3 flatpacks are large letter cardboard envelopes, providing heavy duty packaging for delivering A4 brochures, calendars, DVD’s, photos, photo frames, diaries, journals, arts & crafts and more through the postal system. The F3 is made from 150gsm ‘Kraft’ e-flute corrugated board; very stiff, tough stuff.  Every single flatpack in our range uses our leading hot melt peel’n’seal / red tear-strip system for easy sealing and easy opening.  Plus, they are all 100% recyclable and FSC™ certified / PEFC approved. Tough packaging doesn’t get better than this!

AusPost and Royal Mail Large Letter cardboard envelope maximiser, for cheap postal tariff mailings. Our sizes are extensively researched to get the snuggest fit – and lowest cost mailing tariff.

If you’re using stiffeners, void-fill or airbags in your packaging, the Lil F3 flatpack is a better way to package what you’re sending.The Lil F3 is the stiffest envelope known to man!

Our tough large letter flatpacks are fast to pack because release paper overhangs the hot melt peel and seal flap. The hot melt adhesive peel and seal closure provides the best seal – at least twice the strength of standard double sided-tape.

Safe in transit but easy to open when it arrives. This really is tamper proof packaging.

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 delivering unrivalled service. Over 98% of our orders are dispatched within 24 hours.

Additional information

Weight 79 g
Internal Width MM


Internal Length MM


Internal Width Inches


Internal Length Inches


Flap Type

Hotmelt Peel & Seal with red rip strip opening

Quantity per Box/Pack


Quantity per pallet



Brown Corrugated

Item Thickness

150K E

Glue Seams

External seams

Item Weight (g)


Pallet Size

100x120x165cm / 40x48x65″



fits large letter

fits large letter

FSC® certified products

FSC® certified products

100% Recyclable

100% recyclable

supplied form strapped

supplied form strapped

peel 'n' seel

peel 'n' seal

easy open tear strip

easy open tear strip