Double Wall / Removal Boxes. Archive Boxes With Handles. CUSHIONING & VOID FILL. Jiffy Foam Wrap Rolls. Edge & Corner Protection. Acid Free Tissue Paper. Plain / Window Envelopes. Printed Tapes (Fragile Etc). Carrier & Paper Bags. Centrefeed & C-Fold Tissue Paper. Disposable Gloves & Aprons. Price Labels – Retail. 40 X-LARGE S/W CARDBOARD PACKING BOXES 20x20x28 MAXIMUM SIZE YODEL PARCELFORCE. These boxes have been manufactured to have the maximum internal dimensions that yodel and Parcelforce allow to be sent in their network, under their standard 24hr or 48hr services. The internal dimensions of the boxes are 510x510x715mm (51x51x71.5cm). The external dimensions of the boxes are 516x516x727mm (51.6×51.6×72.7cm). All measurements are length x width x height. To calculate the size of this box using yodel or Parcelforce’s volumetric calculation, simply use the below. Yodel 24 or 48 – this states that the box must be less than 0.23 cubic metres. The external size of this box once assembled and taped is 0.52×0.52×0.73m = 0.21 cubic metres (less than their maximum of 0.23 cubic metres). Parcelforce 24 or 48 – the length plus girth must equal less than 3 metres. In this case, the calculation using the external measurements of the box is 0.73+(52+52)2 = 281cm (less than their maximum of 300cm). The above box suits this profile as you can see from the calculations above, and is the maximum size allowed under their service. Please note that if you overpack the box, or stretch it, then volumetric charging may apply. This box has been designed with all intent and purposes to have the maximum dimensions allowable for the above purposes, but we cannot take any responsibility for the courier service or any charging that may apply. Please check the dimensions yourself thoroughly before sending, once packed, to ensure it does not go oversize. Flat-pack single wall 20″x20″x28 boxes. All orders placed by 3pm (Mon – Fri) will be dispatched on the same day. Collection is available from our 60,000 sq ft warehouse in Hayes, Middlesex. Our aim is to keep our customers 100% happy. Jiffy Bubble Padded Envelopes. Single & Double Wall Boxes. Small & Large Bubble Wrap.