OSOffice Supplies Guide UK

UK office product comparison

Best Office Packing Cartons
for 2026.

For best office packing cartons, start with carton size, board strength, flat-pack format and pack quantity. Each product below is set against the other four, with the title-level differences kept clear and practical.

Prices, stock, delivery and final specifications should be checked on the retailer page.

How this page works. Five relevant catalogue products are compared, and every card uses the other four as its reference point. The copy is based on listed product information, not hands-on testing.

Best starting point

Go Secure E-Letterbox 260x110x30mm 100 Per Cent Recyclable PB10242

This is the first option to inspect when secure is central to the job.

View product

Compare the options

Our picks compared

All five products are shown here. The table keeps the useful catalogue cues together, while the cards explain how each pick differs from the other four.

ProductRetailer categoryTitle cues
Go Secure E-Letterbox 260x110x30mm 100 Per Cent Recyclable PB10242Packing Cartonssecure, letterbox
GoSecure Heavy Weight Box 457 x 305 x 305mm (Pack of 15) PB07575Packing Cartons305mm, pack of 15
GoSecure Heavy Weight Box 610 x 457 x 457mm (Pack of 15) PB07574Packing Cartons457mm, pack of 15
GoSecure Post Box Size B 318x224x80mm (Pack of 20) PB02281Packing Cartonspack of 20
GoSecure Post Box Size C 350x250x160mm (Pack of 20) PB02279Packing Cartonspack of 20

Product notes

Five different buying angles

Best secure cue

Go Secure E-Letterbox 260x110x30mm 100 Per Cent Recyclable PB10242

This option earns attention for its secure wording.

This listing reads differently because secure is the clearest cue in its name.

What we don't like

  • Secure is title-level detail only.
  • Less pack of 20 detail than GoSecure Post Box Size C 350x250x160mm….
ProductGo Secure E-Letterbox 260x110x30mm 100 Per Cent Recyclable PB10242
Retailer categoryPacking Cartons
Title cuessecure, letterbox
Comparison positionPick 1 of 5. Four alternatives are compared in the bullets.
View product at Office Monster

Best defined 305mm option

GoSecure Heavy Weight Box 457 x 305 x 305mm (Pack of 15) PB07575

A practical place to start if 305mm decides the fit.

The catalogue makes 305mm the clearest angle, unlike Go Secure E-Letterbox 260x110x30mm 100….

What we don't like

  • 305mm is title-level detail only.
  • Less secure detail than Go Secure E-Letterbox 260x110x30mm 100….
ProductGoSecure Heavy Weight Box 457 x 305 x 305mm (Pack of 15) PB07575
Retailer categoryPacking Cartons
Title cues305mm, pack of 15
Comparison positionPick 2 of 5. Four alternatives are compared in the bullets.
View product at Office Monster

A clear 457mm pick

GoSecure Heavy Weight Box 610 x 457 x 457mm (Pack of 15) PB07574

A pick for packing cartons when 457mm is central to the choice.

The catalogue makes 457mm the clearest angle, unlike GoSecure Post Box Size B 318x224x80mm….

What we don't like

  • 457mm is title-level detail only.
  • Less pack of 20 detail than GoSecure Post Box Size B 318x224x80mm….
ProductGoSecure Heavy Weight Box 610 x 457 x 457mm (Pack of 15) PB07574
Retailer categoryPacking Cartons
Title cues457mm, pack of 15
Comparison positionPick 3 of 5. Four alternatives are compared in the bullets.
View product at Office Monster

Best fit for carton size

GoSecure Post Box Size B 318x224x80mm (Pack of 20) PB02281

Choose this over GoSecure Post Box Size C 350x250x160mm… when the carton size cue fits your brief.

The practical value is tied to carton size. Check the live retailer details before comparing the final cost with the other four.

What we don't like

  • No clear edge over GoSecure Post Box Size C 350x250x160mm….
  • Check carton size against GoSecure Post Box Size C 350x250x160mm….
ProductGoSecure Post Box Size B 318x224x80mm (Pack of 20) PB02281
Retailer categoryPacking Cartons
Title cuespack of 20
Comparison positionPick 4 of 5. Four alternatives are compared in the bullets.
View product at Office Monster

The flat-pack format alternative

GoSecure Post Box Size C 350x250x160mm (Pack of 20) PB02279

The listing makes its clearest case around flat-pack format.

This listing reads differently because flat-pack format is the clearest cue in its name.

What we don't like

  • No clear edge over GoSecure Heavy Weight Box 457 x 305 x….
  • Less 305mm detail than GoSecure Heavy Weight Box 457 x 305 x….
ProductGoSecure Post Box Size C 350x250x160mm (Pack of 20) PB02279
Retailer categoryPacking Cartons
Title cuespack of 20
Comparison positionPick 5 of 5. Four alternatives are compared in the bullets.
View product at Office Monster

Buying checks

What to check before ordering

Compare carton size, board strength, flat-pack format and pack quantity. Then confirm the exact variant, delivery access, assembly requirements, returns terms and quantity on the retailer page.