I do a significant part of my grocery shopping in a co-op that is set up for you to take in your own package. I take jars and plastic bottles, weight them befor

I do a significant part of my grocery shopping in a co-op that is set up for you to take in your own package. I take jars and plastic bottles, weight them before using them in the shop, fill them up with sugar, flour, pasta, oil, soap, etc. I haven't noticed it taking any longer than a regular shop run, other than needing the foresight to prepare the bags of jars before hand and the need to go by car which is already kind of a given here.