14 Products Every Marathoner Should Own, According to Pro Runner Emily Sisson

Nathan Push-Pull Cap Flask ($8 for a 2-pack, originally $10)

If you're running for more than an hour (which, if you're marathon training, you definitely are), you should probably be hydrating along the way. Sisson prefers a small bottle that's easy to hold, so that she doesn't feel rushed to chug her drink. Distance running legend Des Linden recommended Nathan bottles to Sisson before her first marathon, and she's stuck with them since.