It depends on what is being packed. If it's the drink straps and koozies, and fanny pack/messenger bag those are still packed from the last trip.
We are leaving in about 3 weeks and I already have our "summer" clothes packed. We're in the middle of a record number of days of snow on the ground and for the first time in almost a month we are above freezing, not that the snow that is falling....again really cares. LOL So my capris, and jean skirts and
crocs are packed. As is the shampoo, and other needed items that I bought for the trip. My packing list has been done, and altered since the last trip in May.
Today the DH and I went out and bought new crocs/tennis shoes to break in and I've packed the new socks, shirts, etc that we needed. There are some things that won't get packed until the last 15 minutes we are home, but I will have a list on the front door reminding me to grab those things.
I just like to take my time and pack slowly, there is less chance of my panicking that last week. This trip is different though...we're leaving the kids with grandma so...I have a huge list for them too.