Decisions, decisions, decisions; which jar would be the best for a student DIY biosphere project? Volume wise from left to right is 2L, 2.5L, and 4L. Cost wise from left to right is $4.99, $3.19, and $8.50. I was euphoric when I found the pickle jar at ALDI’s, because it reminded me when I was a little boy making science projects. From a kid’s point of view, economic barriers are everything in making a project. At 13, my income was from a paper route. The pickle jar is the cheapest and can be justify in the family food budget as the cost of food besides having the advantage of a sealed cap. In comparison, the gallon cookie jar will have to be sealed with silicone at an added cost. I am going to try all three for biospheres and do a comparative study. The gallon jar is more aesthetically pleasant, but will require a larger footprint in a household limited surface space and most expensive.