Modelling to start the ideas process or to develop design concepts further.
Paper, card, CAD software such as Google SketchUp or using CAM such as laser cutting and 3D printing
Really good techniques for design and developing ideas through paper and card.
Modelling containers can be done as making simple cuboids like the ones below and arranging them in different set ups and photographing them. The images can then be drawn on to show alternative design developments to help your ideas grow. You can also construct simple design extensions for them out of paper or card. You can use different applications to complete the drawing on your photographs.
Paper architecture: Developing your ideas further to think about how the containers can be adapted or added to to enhance the aesthetics on your design.
Toothpick Nations: The art of paper: folding, pleating and manipulation
https://www.toothpicnations.co.uk/my-blog/?p=38622
http://www.bapq.net/summer-11/origami-art_paul-jackson.asp