Glass jar is still the common packaging for jam and jellies. It is also the first choice of package for starting food entrepreneur.
The sardine on the right was packed in a glass jar. But sooner of later, its manufacturer is going to switch to metal package.
Glass package provides an excellent protection against food spoilage. The glass itself is inert, it will not react to any chemicals and very heat resistant. It also prevent the entrance of oxygen provided with a good cap. Oxygen is needed by most bacteria and other spoilage organisms.
Glass bottle can be reused a million times as long as it is in good condition. No cracks and free from indelible materials. Just wash and sterilize it thoroughly and the bottle is ready for its next duty.
But glass are prone to breakage. One drop mistake and your product is gone for good. And, cost per piece and handling costs are high.
Tin can match the inertness of the glass package provided that it has a good lacquer coating that matches its product content. Excellent in keeping oxygen-free environment and resistance against drops and other external forces. Cost per piece and handling costs are relatively low as compare to glass jar.
But, metal packages cannot be reused and it is prone to rusting.
There are other choices of packaging that you can choose like laminated foils. But acquisition cost for beginners is too high.