I believe Nature is everywhere and should be enjoyed everywhere and anywhere and whenever I have a moment. I also think that my sketchbook is for anything really and I draw and record all sorts of moments in it. So my supplies are always with me and I admit that I have the gigantic purse full of stuff. So, my supplies need to be light and portable since I need room for my wallet, snacks, library cards, chapsticks, gum, and reuseable shopping bags.
I am experimenting with a new sketchbook format. It has one signature and fits in a little sleeve, made from a file folder, that I decorated. It is really light and fits in my purse without adding too much weight. The signature is a combination of Arches hot press, cold press and Canson mi-Teintes paper. I find that the colored paper forces me to be creative in a new way which is why I add it. My plan is that after I have completed 4 or 5 signatures I will bind these together in a cover.
For my other supplies, I carry a mechanical pencil, a Pentel click eraser, a non photo blue pencil, my Koh-I-Noor Nexus pen and sometimes a White Uni-ball Signo pen. My other favorite pen is a Pentel Pulaman pen which bleeds like crazy when you go over it with water but this is exactly what I love about it. Finally I usually have a decoy pen. This is the pen I hand over when someone asks me for a pen or I use when I need to write a check. I love to carry a purple one but any pen in any color will do. I don't want to give anyone my Nexus or Pulaman pen and most people know I have a pen on me for sketching so they are perplexed when I claim I don't have one. I simply don't have one I want them to use and that does seem rude. Just for them I carry my decoy pen.
If I am feeling like carrying more or am on a specific sketching outing I will bring along my watercolor kit which consists of my palette and a Pentel Aquash water brush. There are a variety of these brushes on the market but this one is my favorite. Basically it contains water in the barrel so you don't need a water container to paint. If you lightly squeeze the barrel a small amount of water comes out and this can wet your paints or if you rub it on a paper towel, clean your brush.