That's why geologists wear a vest in the field. And a utility belt. And a backpack. Cargo pants. So many pockets to hold so much stuff. Compass, map, knife, pencils, maps, hydrochloric acid, scratch plate, gloves, rock-hammer, chisel, sample book, note book, protractor, ruler, straight edge, sample bags, sample tags, flagging, keys to the truck, lunch, water, snacks, magnet, camera, tape measure, string box (measures distance on a traverse using a piece of thread), extra socks, first aid kit, radio (maybe), flashlight (for old mine exploration), zippo lighter (for determining O2 levels in old mines; and/or smoke 'em if you got 'em.), plus many other thing you could pull out in triumph if needed. (Nod to Samwise.) And this was before cell phones and GPS.

Note: if you do a lot of hiking / mapping, get a good dedicated GPS unit. Phones don't cut it out there. Get one that downloads as a .gpx file and you are good to go with most open source, or licensed, GIS software. From that, you can build your map from your notes and field maps.

"Weapons take" as a field geologist is entertaining. And, at the end of the traverse, I'd have added twenty or more pounds of sample to the kit. If you are doing a through traverse, you have to carry each sample as you go. If it is a there-and-back again, you leave the samples on the trail and collect them on your way back to the truck and beer-thirty.

I had friends who, while on casual, unburdened hikes, tell me I should get lighter hiking boots. All I could do to not burst out laughing.

I have known geologists that had dogs with packs.

The only blade I needed in the field was a good, but not overly endowed, Swiss Army Knife. Like a good friend, they are.