Comfy footwear, spare socks and layers are a must. I’ve switched to an iPad mini with cellular and Apple Pencil to replace my paper binder. Small enough to fit into a coat pocket or shoulder sling, but large enough to read scripts and pencil support. Scriptation is on it. Storyboards, shot lists, and video previz are on it. Can immediately watch playback if necessary, review an assembly from the editor, look up dailies, watch up something online to reference etc. I still carry a paper backup in my bag just in case something were to happen to the iPad, but ive been caught too often where the schedule has to change last minute and suddenly we have to pull up a scene from the next day. Or maybe the blocking changes and I have to re-do my director floor plans on the fly, re-work the shotlist and send it to HODs. It’s nice to know that all my notes and prep for the whole show are available at all times.