I have not built a rack around the 41 qt. Sterilite but do have some ideas. As I mentioned in another post yesterday, when boxes get over 32" long it is often very difficult to build racks and utilize the material well.
One method is to do what the other poster showed - have the sides not as deep as the shelves. This works pretty well. You could even go as extreme as what I did with this rack, using strips of plywood for form vertical supports.

And then there is the design that Bighurt showed, although that one takes some time, tools, and talent.
Lastly, I have found that hollow-core door blanks lend themselves to an inexpensive and fairly light rack for larger boxes.
You could easily build a rack from 36" HC door blanks and even build it so it can be broken down so it could be moved.
That's sort of what I did here, but this rack is 32" so I can fit it through the 36" door of my snake room.

I got the idea from Riobravoreptiles.com where I first saw this rack:

He shows how to cut down the HC doors and build such a rack on his site. This would work for the 41 qt. box but understand even though the rack will be light it won't be easy to move. It will have a footprint of about 36" x 35" and won't fit easily into most rooms.
Hope this helps.