There are basically two schools of thought when assembling a kit for an ultramarathon, and they’re about the same as any sort of race, hike or expedition: comprehensive preparation and more weight, or as minimalist as possible. The decision gets easier for experienced racers who know how to measure their needs versus what’s available on the course and what they can leave at drop stations, but for first-time ultra-distance runners, the decision can be a little confounding. You want to be very prepared and very light. This setup for the Vermont 50 — a trail run — reflects a good balance of preparedness and weight, with a bias toward the former in the choice of a hydration pack.
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Geigerrig Rig 500

We tested several hydration packs this season, from minimalist running vests like the Ultimate Direction SJ Ultra Vest to commuter bags to hydration-equipped backpacks for all kinds of adventures. Geigerrig’s pressurized hydration and in-line filtration makes it a perennial favorite of ours. The Rig 500 carries 70 ounces (2L) of water and has a dry capacity of 500 cubic inches (11.47L), plenty of room for some stored nutrition, a jacket and a small first-aid kit. The back panels are ample and comfortable, though some chafing is inevitable. Overkill? Sure. But it sure is nice to be able to spray down your face during a long run or wash out a cut should you stumble over a root miles from civilization.
Gore X-Running Light Windstopper Active Shell Jacket

Want to save weight and be prepared for weather? This jacket is as light as a handful of unused fancy tissues (88 grams) and packs down to fit in virtually any pocket or around a belt loop. It’s 100% nylon with a Windstopper Active Shell construction, which uses an inner membrane to block wind chill and keep water out while remaining light and breathable when your core temp rises. Bonus points for a comfortable, athletic fit and good looks that can pass for everyday wear…well, maybe in Boulder.