Nevertheless, you need to make decisions and pare things down. It's good to travel light, otherwise you aren't able to carry your kit with you 'just in case'. I have 3 versions of my kit. The slim-line version is just my trusty Sailor pen and an A5 - A6 book, which you don't even notice you're carrying. I tend to have these in a pocket most of the time, because you never know.
My full kit, for sketching day's out, is still pretty compact as I hate being loaded down. All the art equipment packs up into a zipper bag, the size of the average toiletries bag, which slips easily into a large handbag, along with a sketchbook or two.
If it's an urban day, I usually pop my mini-stool in my bag too, so I don't have to look for benches or doorsteps. It weighs nothing and fits in a large handbag:
If I'm going rural, this foldaway sitting-mat from a camping shop is way better, because of uneven ground:
I have had to unpack my full kit this week and photograph every individual element for the book. This is because I want to dedicate a spread to peering inside my kit-bag, with pictures of everything and annotations, telling people exactly what each item is and why I have chosen it. I photographed 28 different items like this:
My snaps are not the photos we will end up using, but the designers need to know what everything looks like, so they can design suitable graphics for the page. Once that's done, the publisher will commission a proper photographer to take the pictures they need. In the meantime, I have been writing all the text.
If you are interested in getting some of the specific items like the Sailor or the stool, I have put together some links to where I got them. It's on Facebook here, as part of the Usk Yorkshire website.