You may find these supplies useful if you paint en plein air:
pencil wraps and cases
wet canvas carrier
water brushes for wetting watersoluble pencils or pens
water soluble sketching pens
viewfinder and view catcher
umbrella and clamp
new metal watercolour boxes
Click on the underlined link to go to that item on the Jackson’s Art Supplies website.
What would you add to this list?