A Familiar Scene at the Start Line
Anyone who has stood in a corral for a 4:30am gun time in this region has seen it: hundreds of runners in thin plastic ponchos or holding small folded umbrellas, waiting out an hour or more of standing around before the race even starts. It isn't rain gear in the conventional sense -- plenty of these runners aren't expecting to run in rain at all. It's about surviving the wait: humid pre-dawn air can still feel clammy and occasionally drizzly, and a poncho or umbrella is cheap insurance against getting damp and cold before you've even started moving.
The habit is regional and specific rather than universal to marathons everywhere -- it shows up because so many Southeast Asian races share the same structural problem of very early gun times combined with long pre-race waits at outdoor venues, often with limited covered shelter for a field of several thousand runners at once.
Why It's Disposable Gear by Design
The ponchos runners wear in these corrals are almost always the cheapest available option -- thin, single-use plastic sheets rather than a proper rain jacket -- and that's deliberate, not a compromise. Nobody wants to carry a bulky, packable rain layer through 42 kilometers, so the gear that shows up at the start line is chosen specifically to be worn once, briefly, and then abandoned without a second thought.
This is also why the moment right before the gun looks the way it does: a visible pile of discarded ponchos and, less often, umbrellas handed to a spectator or volunteer, appears at the edge of the corral in the final minute or two. Race organizers in the region have adapted to this -- some now specifically collect abandoned ponchos post-gun for recycling or donation, treating the pile as an expected part of race-morning logistics rather than a mess.
Poncho or Umbrella: What Runners Actually Choose
A disposable poncho is the default for most runners because it's genuinely hands-free -- you can still adjust your bib, stretch, and queue for a last toilet trip without holding anything. It's also cheap enough, often under two dollars, that buying one specifically to throw away afterward doesn't feel wasteful the way discarding a real jacket would.
A compact umbrella shows up more with runners who arrive very early and expect a longer wait, or in genuinely wet pre-dawn conditions where a poncho's limited coverage isn't enough. The tradeoff is that an umbrella needs a hand to hold it, which is awkward once you're doing final warm-up strides -- most runners who bring one plan to hand it off to a friend, family member, or volunteer right at the corral entrance rather than try to fold and carry it mid-race.
Packing for the Wait Without Overthinking It
The practical approach is to treat pre-gun coverage as entirely separate from race-day rain gear -- bring the cheapest poncho or smallest umbrella you can find specifically for standing around, and plan to lose it before you cross the start line, rather than trying to find one durable piece of kit that does both jobs. A dedicated race-day rain layer (covered in this site's other gear guides) is a different purchase for a different problem: staying dry while actually running.
For runners traveling from outside the region, buying a cheap poncho locally the day before -- from a convenience store, pharmacy, or the race expo itself -- is simpler than packing one from home, and matches what most local runners already do rather than treating it as unusual advance preparation.