{"id":3602,"date":"2026-10-27T16:01:37","date_gmt":"2026-10-27T08:01:37","guid":{"rendered":"http:\/\/www.scholarshipalarm.com\/blog\/?p=3602"},"modified":"2026-10-27T16:01:37","modified_gmt":"2026-10-27T08:01:37","slug":"are-kraft-paper-bags-resistant-to-moisture-4bcb-134872","status":"publish","type":"post","link":"http:\/\/www.scholarshipalarm.com\/blog\/2026\/10\/27\/are-kraft-paper-bags-resistant-to-moisture-4bcb-134872\/","title":{"rendered":"Are kraft paper bags resistant to moisture?"},"content":{"rendered":"

Hey everyone, thanks for dropping by my little corner of the blog \u2013 I\u2019m Jake, and I\u2019ve been running this Kraft paper bag supply spot for almost 8 years now. If you\u2019ve ever shopped for packaging, you\u2019ve probably wondered the same question a lot of my regular clients throw at me: \u201cAre kraft paper bags actually resistant to moisture?\u201d Kraft Paper Bags<\/a><\/p>\n

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Let me cut to the chase right off the bat \u2013 there\u2019s no one-size-fits-all answer here, and that\u2019s exactly what I want to break down today, no fancy industry jargon, just the real stuff I\u2019ve learned talking to coffee roasters, food trucks, and retail brands that come to me for bags that don\u2019t fall apart when it rains or when they\u2019re holding something a little damp. First, let\u2019s start with what makes kraft paper bags, well, kraft paper in the first place. Unlike regular copy paper or thin wrapping paper, kraft paper is made by pulping wood chips in a harsh chemical solution (the kraft process, duh) that strips out a lot of the weaker fibers, leaving those super strong, long wood fibers. That\u2019s why standard uncoated kraft bags feel tough \u2013 they can hold a lot of weight, but moisture is their kryptonite, full stop.<\/p>\n

Wait, let\u2019s get specific. Plain, no-frills kraft paper bags \u2013 the ones I ship to bakers who just need something for cookies, or farmers markets for veggies \u2013 are only mildly moisture-resistant, if that. I once had a client a few years back, a local craft lemonade stand, swear their bags were \u201cmoisture-proof\u201d until a sudden summer storm hit, and half their inventory turned into soggy, droopy messes that looked like used tissues. Why? Because plain kraft paper is porous \u2013 those little tiny gaps between the fibers let water molecules seep right in, and once they do, the fibers swell, weaken, and the bag tears way easier than it should. If you\u2019re using it for dry stuff only \u2013 like granola, dry pasta, or small hardware parts \u2013 that\u2019s fine. But if it\u2019s going to be exposed to any amount of moisture, that plain stuff isn\u2019t going to cut it.<\/p>\n

Now, that\u2019s the boring baseline, right? So here\u2019s what I tell every customer who asks about moisture: there are different levels of moisture resistance, and we tailor exactly what you need for your product. Let\u2019s go through the common types because this is where most people get confused. First, there\u2019s grease-resistant coated kraft \u2013 I know, sounds like two totally different things, but it works for stuff like fried chicken, potato chips, or butter. That coating (usually polyethylene, or a thin layer of food-safe wax) forms a barrier on the paper that keeps grease out and slows down moisture from getting in. It\u2019s not 100% waterproof, don\u2019t get me wrong \u2013 if you leave a bag of these fries sitting out in a heavy downpour for an hour, it\u2019ll still get damp. But if you\u2019re just dealing with the occasional spilled soda, condensation from a cold drink cup, or even the little bit of moisture that comes from a bakery item fresh out the oven, this stuff holds up way better than plain kraft.<\/p>\n

Then there\u2019s the stuff we call \u201cpoly-coated kraft\u201d \u2013 same idea, but the polyethylene layer is a little thicker, so it\u2019s more durable when wet. A lot of our seafood suppliers use this, for example \u2013 they need bags for shellfish that might have a little water from the ice, or even for takeout soups (the ones that aren\u2019t super liquid). I remember a fish market client switched from plain kraft to poly-coated last year, and he told me he only had 2 bad bags in 6 months, compared to like 15 before. That\u2019s the difference a thin coating makes.<\/p>\n

Wait, but here\u2019s a myth I hear all the time: people think \u201ckraft\u201d is only that plain brown stuff. Nope! We also do white kraft, which is the same process, just bleached, and it can have the same coatings applied. Also, if you\u2019re looking for something way more heavy-duty for moisture, we have laminated kraft \u2013 that\u2019s where the paper is sandwiched between two layers of a plastic film, so it\u2019s basically water-resistant, even for a little while. It\u2019s not meant for full submersion, obviously, but if you\u2019re shipping produce cross-country, or holding ice for an event, that laminated stuff won\u2019t get soggy.<\/p>\n

But let\u2019s talk about what no one tells you \u2013 even the best coated kraft bags have a limit. All of that protective layer is only as good as the manufacturing, right? I\u2019ve seen cheap bags from random suppliers where the coating is too thin, or it\u2019s applied unevenly, so it peels off after a few uses. That\u2019s why I make a point to test every batch we get \u2013 I pour a little water on a sample, squeeze it, hold it for 10 minutes, to make sure it doesn\u2019t leak. A lot of new clients come to me after getting burned by a low-quality supplier, so I always show them those test samples before they place an order. That\u2019s how I stay in business, right? No flimsy stuff.<\/p>\n

Another thing that affects moisture resistance? The thickness of the kraft paper. Standard grocery bags are like 30 lbs kraft, right? That\u2019s pretty thin, so even coated, it\u2019s not going to hold up in heavy rain. We carry up to 60 lbs kraft bags \u2013 that\u2019s a lot thicker, the fibers are denser, so when you add a coating, it\u2019s way more resistant. I had a food truck client who sells snow cones in the summer; he used to get thin coated bags that would get soggy halfway through the day when the ice melted. Switched to 50 lbs coated, and he hasn\u2019t had a complaint in over a year.<\/p>\n

Wait, let\u2019s get into the science a little, not just the anecdotes. The kraft process, like I said, creates long cellulose fibers. When those fibers absorb moisture, their hydrogen bonds break down, which makes the paper weaker. That\u2019s why even strong kraft is less durable when wet \u2013 the fibers expand, and the gaps between them get bigger, so moisture gets in more. A coating, whether wax or poly, blocks the water molecules from bonding with the cellulose fibers, so the paper stays strong. That\u2019s the actual science behind it, no fluff.<\/p>\n

But here\u2019s the thing \u2013 I always tell clients not to overspend on a level of moisture resistance they don\u2019t need. If you\u2019re a coffee roaster who\u2019s putting whole beans in a sealed bag inside your kraft bag, you don\u2019t need the thick poly coating. Plain kraft is totally fine. If you\u2019re a bakery selling fresh croissants that might have a little oil on the paper, go with the light grease-resistant coating. If you\u2019re a seafood market, get the heavy poly. That way, you\u2019re not paying for stuff you won\u2019t use, and you\u2019re not ending up with bags that fail at the worst time.<\/p>\n

I also get asked a lot about recycled kraft bags \u2013 are they less moisture-resistant? Honestly, it depends. Recycled kraft can have shorter fibers, or sometimes leftover ink or chemicals from the recycling process, which can make the paper a little more porous. But we source our recycled kraft from suppliers that test for moisture resistance, and we apply the same coatings, so they\u2019re just as good as virgin kraft, for half the cost. A lot of eco-conscious brands love that, and I make sure to tell them that recycled doesn\u2019t have to mean flimsy.<\/p>\n

Let me share a personal story that drives this home. A few years back, I did a big order for a pop-up outdoor market that was going to have it rain for the entire weekend. The organizer insisted on plain kraft, said they were \u201cmore sustainable\u201d and didn\u2019t want coatings. I warned them, but they went with it. By Saturday afternoon, half their product bags were soggy, their display bags were falling apart, and they had to spend half their budget replacing them with plastic garbage bags just to hold the stuff. That\u2019s the mistake I see people make all the time \u2013 ignoring the actual use case for the sake of being eco or cheap. I\u2019m all for eco-friendly, but if you need moisture resistance, you need to choose the right kraft for the job.<\/p>\n

So, to sum up: plain uncoated kraft paper bags have minimal moisture resistance, great for dry goods only. Grease-resistant or light poly-coated kraft has moderate moisture resistance, perfect for food with light oil or occasional condensation. Thick poly-coated or laminated kraft has high moisture resistance, good for seafood, cold drinks, or outdoor events. The key is matching the bag to what you\u2019re using it for \u2013 that\u2019s way more important than just asking \u201care they moisture resistant?\u201d<\/p>\n

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Now, if you\u2019re a brand, food truck, retailer, or anyone else who needs kraft paper bags, whether for dry goods, food, events, shipping, whatever \u2013 I\u2019d love to help you pick the right one. No hard sell, just real talk about what will work for your needs. Shoot me a message, we can talk specs, samples, whatever you need. Don\u2019t waste another order on bags that fall apart when it\u2019s even a little damp. Hit me up, let\u2019s make sure you get the right bags for your business.<\/p>\n

Non Woven Bag<\/a> References<\/p>\n

    \n
  1. Smallwood, I. M. (2014). Handbook of Paper and Board. Wiley.<\/li>\n
  2. Technical Association of the Pulp and Paper Industry (TAPPI). (2021). Standard Test Methods for Water Vapor Transmission of Paper and Paperboard.<\/li>\n
  3. Kraft Pulping Process. (2020). Paper and Pulp International.<\/li>\n<\/ol>\n
    \n

    Wenzhou Hangyi Packing Co., Ltd.<\/a>
    As one of the most professional kraft paper bags manufacturers and suppliers in China, we also support customized service. Please rest assured to wholesale bulk durable kraft paper bags in stock here from our factory. If you have any enquiry about pricelist, please feel free to email us.
    Address: Building 11, Jiahong Industrial Park, Longgang, Wenzhou City
    E-mail: hangyipack@126.com
    WebSite:     https:\/\/www.hangyipack.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey everyone, thanks for dropping by my little corner of the blog \u2013 I\u2019m Jake, and … Are kraft paper bags resistant to moisture?<\/span>Read more<\/a><\/p>\n","protected":false},"author":561,"featured_media":3602,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3565],"class_list":["post-3602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-kraft-paper-bags-45b3-146ab1"],"_links":{"self":[{"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/posts\/3602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/users\/561"}],"replies":[{"embeddable":true,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/comments?post=3602"}],"version-history":[{"count":0,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/posts\/3602\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/posts\/3602"}],"wp:attachment":[{"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/media?parent=3602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/categories?post=3602"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.scholarshipalarm.com\/blog\/wp-json\/wp\/v2\/tags?post=3602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}