Its inspiring to find businesses that are doing everything to reduce their plastic footprint. What you are doing at your company is very awesome @artemislives and can't wait to see how you finally install the drip irrigation systems for the Moringa plants.
In Cameroon, the bigger plastic containers like the 5L you have are very valuable and don't really constitute a problem. Its sold here for almost 1.5USD. If you were in Cameroon, you could be making some really cool cash from you plastic containers.
Keep doing the awesome work in promoting natural medecine and protecting the environment.