5 Best Backpacking Rain Pants | 6.3 Ounces of Storm Protection

Check Price on Amazon

The featherlight shell that survived a week of nonstop Icelandic rain.

At just 5 ounces, these pants are the lightest in this lineup. One reviewer even measured 6.3 ounces on their own scale. Yet another buyer reported they “kept me dry for 7 days pouring down every single day.” The 100% nylon fabric uses a 30D ripstop weave (a fabric thickness that resists tearing) with a Pertex Shield membrane (a thin waterproof layer) so your legs stay dry in cool-weather hiking. For a shell that packs to nearly nothing, that is an outstanding real-world result.

What makes the Helium such a well-rounded choice is how it handles the small details. The elastic waistband with gripper tape keeps the pants from sliding down, and the gusseted crotch (a diamond-shaped insert) gives you a full range of motion when stepping over logs or boulders. One buyer with a 34-inch waist found a size medium fit snugly over sweatpants, confirming the standard fit runs trim — good for layering without excess fabric flapping. The back pocket doubles as a stuff sack, and the ankle zippers with snaps let you pull them on over boots quickly. That ankle zipper is much shorter than the full-length zipper on the Badlands Exo, so you cannot vent your whole leg the same way.

The catch here is that the Pertex Shield has limits. One reviewer noted the fabric “soaks through in wet grass or heavy rain,” and at least a couple of buyers mentioned the pocket location is hard to reach with a backpack hip belt on. For sustained downpours or bushwhacking through wet brush, a heavier fabric like the Mountain Hardwear Stretch Ozonic (at 9.6 ounces) might hold up better. But for the hiker who wants the lightest, most packable emergency shelter for their legs, this is the one to beat — just know it is best for cool-weather rain, not tropical downpours. If you face constant heavy wet brush, skip this and pick the more durable Ozonic.

Check Price on Amazon

The budget-friendly shell that weighs less than a granola bar.

At 4.5 ounces, the PreCip Eco is one of the lightest pairs in this roundup, alongside the Outdoor Research Helium at 5 ounces, and it comes from a brand known for reliable outdoor gear. The fabric is a PFC-free DWR (durable water repellent that skips the harsh chemicals) Marmot NanoPro recycled nylon ripstop, so you are keeping water out and keeping your environmental footprint smaller. One buyer used them on an Alaskan fishing trip and confirmed they “worked well” and were “waterproof.”

The PreCip Eco is designed with practical trail features: a drawcord at the elastic waist for a secure fit, side ankle zippers with snap tabs so you can change shoes without taking the pants off, and front zip pockets to stash small gear like a phone or snacks. for sheer packability, Marmot lists the product dimensions as 17 x 17 x 3 inches. For a bargain-minded shopper who wants a name-brand shell that punches above its price, this is a smart grab. One key difference from the Helium: it has front zip pockets, which the Helium lacks, so you can access your stuff without taking off your pack hip belt.

Now, the sizing situation here is a real problem. Multiple reviewers describe these as “massively oversized, like a circus tent” and “clown trousers.” One buyer who ordered an XL based on Amazon’s recommendation said they ended up with a medium. Another reviewer at 5’9″ found the 34-inch leg length too long. You will almost certainly need to size down from your usual, and the material has no stretch, so any mismatch becomes uncomfortable. A few buyers also mentioned non-breathable feel, with one saying “L’acqua la tengono fuori, come le buste di plastica dell’immondezza” — water stays out like a plastic bag, but it does not breathe. For cool-weather use or short downpours this is fine; for a sweaty uphill climb you might prefer the Helium.

Check Price on Amazon

Gore-Tex protection that stuffs into a pouch the size of your fist.

If you want the gold standard in waterproofing and have the budget to match, these Berghaus pants bring a Gore-Tex Paclite membrane (a thin, durable waterproof layer used in high-end shells) into a women-specific cut. The key advantage here is a real Gore-Tex membrane which offers more reliable and longer-lasting waterproof performance than proprietary coatings like NanoPro or Pertex Shield. Side zips let you vent when things heat up, and the pants fold into their own squishable mesh pouch for easy storage.

The Berghaus is designed for the female form, which is a big deal in this category. Many rain shells are unisex or men’s-cut, leaving women hikers with too much room in the waist and not enough in the hips. A gusseted crotch (a diamond-shaped insert that adds mobility) helps you stride and climb without restriction. It is not the lightest option in this roundup, but the Gore-Tex membrane typically offers better breathability than lighter proprietary fabrics. For a multi-day trip where you know rain is coming, giving up a few ounces for the durability of Gore-Tex is a smart trade. Compared to the Marmot PreCip which buyers report breathes poorly, the Berghaus’s Gore-Tex is better for climbing hills without soaking yourself from the inside.

Check Price on Amazon

The only pair here that stretches with you on steep ascents.

At 9.6 ounces, the Stretch Ozonic is noticeably heavier than the Helium at 5 ounces. But what you get for those extra ounces is a 2.5-layer construction (a face fabric, a waterproof membrane, and a thin inner layer that protects the membrane) with four-way stretch fabric that moves with your body. If your hiking involves scrambling over rocks, high steps over fallen logs, or any motion beyond a straightforward walk, this stretch is a standout. The shell is made from 100% recycled fabric, which aligns with Mountain Hardwear’s sustainability push.

The 2.5-layer build is worth understanding: it is lighter and more packable than a 3-layer shell (which adds a separate inner liner), but more durable than a 2-layer. The trade-off is that the inner coating can feel clammy against bare skin if you wear these without a base layer. Buyers who have worn the Ozonic on wet spring mornings report that it handles sustained rain well, though at 9.6 ounces these are not an in-case-of-emergency shell — they are a rain pant you plan to hike in. That stretch is a clear advantage over the non-stretch Marmot PreCip, which some buyers find restrictive on climbs.

Check Price on Amazon

Slip them on over boots in seconds when the sky opens.

The Exo Rain Pant solves among the most annoying problems with rain shells: getting them on fast enough before you get soaked. A full-length side zipper runs from ankle to hip, so you can step into these without taking off your boots. That same zipper doubles as a massive vent when you want to dump heat on a climb. Badlands calls these “ultra-light and 100 percent waterproof” with a breathable membrane, and the pants pack into their own zippered pocket for stashing in your pack.

Coming from Badlands, a brand known for rugged hunting gear, these pants are built for durability. The full-length side zippers use a sturdy YKK-style zipper that should hold up to repeated use. The trade-off for that zipper, however, is a slightly bulkier pack-down size compared to the super-compact Marmot PreCip or Outdoor Research Helium. For the hiker who hates stopping to undress in the rain, the convenience of the Exo design is worth the extra space in your pack. The full-length zipper is a clear advantage over the Helium’s short ankle zip when you need to cool down mid-climb.