Here's my setup, with a brush holder on the right, a "turps" container hanging from a support bar and, on the left, a clip from a sporting goods shop that I use to hang my trash bag. No tying/untying or blowing away! My palette is a sheet of translucent plexiglas fitted into the cover of an ancient 12 x 16 paintbox. I took off the doohickey on the side so the box would lie flat. In the winter, before I leave home, I squeeze out paint onto a covered palette from Judson's, so I don't have to take off my gloves and mittens and open tubes with freezing fingers. The big palette is just for mixing. One thing you can't see is the sheet of rubbery shelf liner that I use under the box to keep it from sliding off the support bars. That's not usually an issue, but one windy day I noticed that my paintbox had blown sideways and was about ready to topple off. Problem solved.
The easel came with a set of "showshoes" that prevent the easel from sinking into deep snow. I didn't really need them this winter, as there wasn't much snow, but they're kind of cute.
My medium is Liquin, which I keep in a squeeze bottle (thanks to Mary Byrom for that tip!). I can squeeze out just the amount I want, using one still-gloved hand, with no mess. Everything fits in the box (including a 12 x 16 panel) except my lunch, water, a sketchbook and the paper towels, all of which go into a small backpack. The whole thing sets up or breaks down in about two minutes, not counting cleaning off the palette. This easel is my favorite piece of art equipment ever!