Hi Druid, I think the answer to your question is how you would like the method of carrying to be? I don't need to walk too far so this is not an issue with me. However, should you have a need for a long trot in to your chosen spot, then I would suggest buying a secondhand framed pack, then you can adapt the frame and the carry straps to suit yourself.

This would be very simple to do but remember to use large washers on the inside of the main box. These will help distribute the weight over a much larger area and relieve a lot of stress on the plastic.

I should add the plastic is reasonably strong but it pays not to take a chance.

In the early hours of this morning I had the idea on going to the $2.00 shop and buying a couple of vinyl pencil cases (or similar). I will velcro these inside the box and they will be ideal for storing spools of leader etc, and my ready made up rigs. I will add a picture to this thread if all goes according to plan.