I do a combo of frequent "daily" trips and weekly trips. We have a family of 6 (2 teens, 1 preteen & 1- 7 yo boy)<--'nuff said about quantity and I have a trailer that I use for Costco-sized runs. For Trader Joe's or Whole Foods runs, I will use either the Travoy or panniers. Just got a cargo bike, so am hoping to replace the trailer and fit our Costco run (every 2 wks) into more doable 1x/wk runs. I love grocery shopping by bike!