Taskmaster Tasks

Select a box, and without breaking any, place the 10 pairs of glasses into it

In the lab there are 10 pairs of glasses. The pairs of glasses may not leave the lab. Without breaking any of the pairs of glasses, put all the pairs of glasses into the smallest of these boxes [Box A the largest, then getting smaller]. You must select your box before leaving the caravan, and may not then change your mind. Smallest box containing all the pairs of glasses with the lid shut properly wins. 

You have a maximum total time of five minutes. 

Your time starts now.