What are the dimensions of a parcel with 2322m3 volume and minimal string usage?

[Procrastinate]

A rectangular parcel with square ends is tied up with string, which passes once around the parcel lengthwise and once crosswise. If the volume of the parcel is 2322m³, find its dimensions if the length of string used to tie it is to be minimised.

V = lwh = 2322

Let D be the dimensions function

D = 2l + 2h + 4w

I am a bit stuck here now because there are three variables and I can't use simultaneous equations to then make D with respect to l or h or w.

Did I interpret the question wrong?

 

[hgfalling]

"A rectangular parcel with square ends" ...