It's really not hard. I have a couple of bags in my laptop bag and always carry a reusable folding bag in my jacket. We have a few in the boot of the car. That accounts for 90% of time I might need one.
you must shop frequently.
I shop 1 to 2 times a month, and buy a large qty when I shop. I absolutely despise going to the store. It is not uncommon for me to need 20+ bags per shopping trip
When I go there are also often people that with 2+ carts, having had to wait in line behind such people using the reusable bags it increased the check out time by a factor of at minimum 2, and sometimes 5x what would be normal due to people attempting to shove as much as they can in a limited number of bags, and they often times have far fewer bags than are need which delay's everyone as they mess around with moving things to maximize space
1. I do not trust them to pick out produce for me
2. They do use plastic bags, we have no taxes or prohibition on the bags here
3. I am not willing to pay the Delivery Fee + Tip. Food prices are high enough as it is