Buy caulk, screen, weather stripping, etc. and fill your cracks and crevices. This will block out insects from entering your home. Spray windowsills and screens with essential oils. Wash off plants well before bringing indoors. Of course canvas bags are the answer.
Some stores give bag refunds.
Try to buy as many bulk items as possible. Avoid disposable items and foam. Use wax paper versus plastic wrap, cloth napkins versus paper. Wax paper and paper napkins are compostable. Eco-Shopping Eat clean and eat green whenever possible.