Packing boxes (6)
I believe the answer is:
crates
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">packing boxes</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for crates that I've seen before include "Rough wooden boxes" , "Packing cases" , "Boxes for shipping goods" , "Jalopies" .)