Posted by Pamusan
on June 19, 2026
![Waterproof Drawstring Backpack [2026] Wet/Dry Pack - Pamusan](http://pamusan.co.uk/cdn/shop/articles/waterproof-drawstring-backpack-final_f9aa6b1e-bbc0-480c-8fb1-ddec6e7d826e.jpg?v=1781694006&width=1100)
You toss a soaked swimsuit and a dripping towel straight on top of your phone, your headphones, and the dry shirt you planned to wear home. By the car, everything smells like chlorine and your bag is damp. A water-resistant impertex waterproof drawstring backpack, a 13 x 18 in cinch-top pack, fixes that exact moment, sealing the wet, sandy, sweaty stuff away from the dry stuff you want to keep clean.
What makes a drawstring backpack actually water-resistant
A water-resistant drawstring backpack is a lightweight cinch-top pack made from a coated, tightly woven fabric that beads off rain, sweat, and splashes instead of soaking them in. Pamusan's version uses 100% impertex at 270 denier with a glossy finish, sized at 13 x 18 in (32 x 45 cm). One rule to remember: it is water-resistant, not submersible, so it is built for rain, pool decks, and damp gear, not for dunking underwater.
Most cotton or thin polyester cinch sacks wick water straight through the weave, which is why your stuff ends up damp. The difference here is the impertex fabric: a coated synthetic with a tight, glossy face that lets water bead and roll off the surface. At 270 denier the cloth is also thick enough to shrug off scuffs from gym floors, pool decks, and trunk rides, so it holds up to daily abuse without feeling stiff or heavy.
The closure matters just as much as the cloth. A simple drawstring closure at the top cinches the opening down tight, and the adjustable cord doubles as a shoulder strap. It is not a zip-and-seal dry bag, but for sweat, rain, and splashes the cinched top keeps spray and drips from reaching what is inside. Black cords on every color keep the look clean whether you carry the bag to the gym or sling it over a beach cover-up.
Wet/dry separation: why it matters for your gear
Wet/dry separation is the whole reason this style earns a spot in your routine. The idea is simple: keep anything damp, sweaty, or sandy away from the things you want clean and dry. Toss your soaked swimsuit and used towel into the cinch sack, and your phone, keys, and fresh clothes ride home in a tote or your car seat instead of swimming in the same puddle.
Because the impertex shell beads off moisture, the bag itself becomes the wet zone. That is a feature, not a flaw. You contain the mess in one place, then shake it out, wipe it down, and the glossy surface dries fast. No more peeling a damp gym shirt off your laptop or finding sand in every pocket two days after the beach.
"The bag becomes the wet zone, so everything else stays dry. That is the entire point of a cinch sack you can trust."Pamusan
5 use cases: gym, pool, beach, rainy commute, and the trail
The same wet/dry logic plays out across nearly every active part of your week. Here is where a water-resistant drawstring pack pulls its weight, and what most people throw inside for each scenario.
Waterproof gym bag: keep sweaty clothes and shoes contained
Sweaty clothes and dirty shoes go in the cinch sack; your clean change of clothes, wallet, and water bottle stay separate. The 270-denier impertex shell wipes down after a leg day that left chalk and floor grime everywhere, so you do not need a separate shoe compartment. The whole sealed sack becomes the shoe-and-sweat zone, keeping odor in one washable bag.
The rest of the week, the same pack shifts effortlessly from the locker room to the pool deck, the beach, the bus stop, and the trailhead. Here is how the other four scenarios play out.
- Swimming and pool: A wet swimsuit and damp towel stay contained while your dry layers ride home in a different bag. The glossy impertex surface shrugs off chlorine splashes instead of holding the smell.
- Beach: Sand and seawater stay in the bag, not all over your back seat. Cinch it shut, shake it out at home, and it is ready for the next trip. Pair it with one of our roomy beach bags for sunscreen, snacks, and a paperback.
- Rainy commute or school run: A sudden downpour will not soak through the way a canvas cinch bag would, so books and electronics get a real buffer from the weather. It also works as a grab-and-go pack for the color your own back-to-school bags crowd who want something kids can carry in any weather.
- Hiking and water sports: Kayaking, paddleboarding, or a trail that turns drizzly all call for a pack that beads off spray. Stash a dry layer, snacks, and your keys, cinch it tight, and keep moving.
Are drawstring backpacks waterproof?
Not in the literal, submersible sense, and it is worth being honest about that. A coated cinch sack like this one is water-resistant, not a sealed dry bag with an IP rating. The impertex shell beads off rain, sweat, splashes, and brief drizzle, and the cinched drawstring top keeps spray from reaching what is inside. That covers the vast majority of real-world situations, from a pool deck to a rainy bus stop.
What it is not built for is full submersion. Do not expect it to keep gear bone-dry if you drop it in a lake or hold it underwater while kayaking. Think of it as a shield against the weather and the mess of damp gear, not a diving accessory. For everyday sports and outdoor use that distinction rarely matters, because the threats you actually face are rain, sweat, and splashes, all of which this fabric handles well.
How to choose: size, fabric, and fit
Three things decide whether a cinch sack actually works for you: the fabric, the dimensions, and how it carries. Get those right and the bag disappears into your routine instead of fighting you. If you are searching for a water resistant drawstring bag, the same criteria apply, since the difference between "water resistant" and "waterproof" matters when you read the label, not when you decide what to buy.
Fabric: look for a coated, tight weave
Water resistance lives in the fabric. A coated synthetic like impertex beads off moisture, while raw cotton or thin polyester soaks it up. The 270-denier weight here is the sweet spot for a sport sack: thick enough to resist scuffs and tears, light enough that it folds down small when empty.
Size: 13 x 18 inches handles most days
At 13 x 18 in (32 x 45 cm) this pack swallows a gym kit, a wet swimsuit and towel, or a beach day's worth of damp gear without turning into a bulky duffel. It is large enough to be useful and compact enough to grab on the way out the door. If you want to compare it against roomier or slimmer cinch styles, the broader drawstring backpacks category lays out the range.
Fit: adjustable cords that double as straps
The drawstring closure cinches the top shut, and the same adjustable cords loop down as shoulder straps, so you tighten or loosen the carry on the fly. Black cords on every color keep the look sharp. For a wider mix of cinch sacks and pouches beyond the waterproof line, the top-level drawstring bags collection is a good starting point.
Impertex vs everyday nylon vs polyester
Fabric is where these bags win or lose. Here is how a coated impertex shell stacks up against the standard nylon and the cotton/polyester cinch sacks you see everywhere, scored on the things that matter for wet gear.
| Feature | Impertex (270D) | Standard nylon | Cotton / polyester |
|---|---|---|---|
| Water resistance | ✓ Beads off rain & splashes | Some, varies by coating | ✗ Soaks through |
| Durability | ✓ 270D resists scuffs | Good, depends on denier | Tears and frays sooner |
| Weight feel | Light, folds down small | Light | Heavier when wet |
| Clean-up | ✓ Wipe down, dries fast | Wipe down | ✗ Holds odor & damp |
The takeaway is straightforward: for keeping wet gear off your dry stuff, a coated impertex shell does the job that plain cotton and thin polyester simply cannot. Standard nylon lands in the middle, but its water resistance swings widely depending on the coating, while impertex is consistent across the whole line.
What do you put in a waterproof drawstring bag?
Think of it as your dedicated wet-and-messy bag. The most common load-out is a damp swimsuit, a used towel, and dirty sneakers after a workout, all sealed away from anything you want to keep clean. At the beach it holds sandy flip-flops, a wet rash guard, and seawater-soaked toys so the rest of your gear stays fresh.
It is not just for wet things, though. On a rainy commute the same cinch sack shields books, a tablet, or a spare layer from a surprise downpour. Trade-show and event crowds use the larger 13 x 18 in size for samples, brochures, and a change of clothes. The rule of thumb: if it is wet, dirty, or needs a buffer from the weather, it belongs in the drawstring pack. Want a personalized look for a team, club, or class? Every shade in the drawstring bags range comes as a custom version you can print with your own design.
Top waterproof drawstring backpacks from Pamusan
Every color comes in two versions: a blank pack ready to use out of the box, and a custom option you can personalize with your own print for teams, clubs, or events. The line offers flexible minimum order quantities, so you can grab a single pack for yourself or order a batch for a whole team. Here are four picks that cover the most popular colors and both options.
Because the custom version is built for promotional, corporate, trade-show, and event use, it has become a popular wholesale and promotional pick for teams and events that want their logo on a water-resistant pack. Whether you need a small batch for a club or a larger run for an exhibition, the same impertex shell and 13 x 18 in size carry across every color.
Waterproof Drawstring Backpack – Navy Blue
Water-resistant impertex with a glossy finish and adjustable black cords. A versatile dark color for the gym, pool, or daily carry.
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Waterproof Drawstring Backpack – Black
The most universal everyday color. Beads off sweat and rain, then wipes clean for the next session.
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Custom Waterproof Drawstring Backpack – Turquoise
A bright pool and beach color you can personalize with a multi-color print for teams or clubs.
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Custom Waterproof Drawstring Backpack – Red
A bold custom option for team or club branding, in the same water-resistant impertex shell.
View ProductPrefer a different shade? Both blank and custom versions come in navy blue, black, white, saxe blue, yellow, green, anthracite, fuchsia, turquoise, and red. Compare the full color spread across the broader drawstring backpacks range to find the right fit for your routine.
Frequently asked questions
Are drawstring backpacks waterproof?
These impertex drawstring backpacks are water-resistant, not fully waterproof or submersible. The coated 270-denier shell beads off rain, sweat, and splashes, and the cinched drawstring top keeps spray from reaching what is inside. That covers everyday sports and outdoor situations, but the pack is not designed to keep gear dry underwater. For full submersion you would want a sealed roll-top dry bag with an IP rating instead.
Can you put a wet swimsuit in a drawstring backpack?
Yes, that is one of the most common uses. Drop your wet swimsuit and damp towel into the cinch sack, pull the drawstring tight, and the water-resistant impertex shell keeps the moisture contained instead of letting it spread to your dry clothes, phone, or keys. When you get home, shake it out and wipe down the glossy surface; it dries quickly and is ready for the next pool or beach day.
Is a drawstring backpack a good wet dry bag for swimming?
Yes. A water-resistant impertex cinch sack works well as a wet dry bag for swimming because it seals your wet swimsuit, damp towel, and chlorine-soaked gear away from your dry clothes and belongings. The glossy 270-denier shell beads off pool water and dries quickly, so you can wipe it down after a swim and it is ready for the next day. It is not a sealed dry bag built for submersion, but for pool-deck-to-car-seat transport it covers the job well.
How do you keep gym clothes from getting your other stuff wet?
Use the two-bag method: keep your clean clothes, wallet, and water bottle in your main bag, and put sweaty clothes and dirty shoes in a separate water-resistant drawstring pack. The impertex fabric beads off sweat and moisture, so the dampness stays in one contained bag rather than soaking everything you own. It is the simplest way to keep your locker-room mess from reaching your dry gear.
What size is the waterproof drawstring backpack?
The pack measures 13 x 18 inches (32 x 45 cm), which is roomy enough for a gym kit, a wet swimsuit and towel, or a beach day's worth of gear without turning into a bulky duffel. It is also a practical size for trade shows, travel, and camping. The adjustable drawstring cords cinch the top closed and double as shoulder straps so the carry adjusts to whatever you load inside.
What is impertex fabric?
Impertex is a coated synthetic fabric with a tight, glossy weave that resists water. These backpacks use 100% impertex at 270 denier, a weight that balances durability with a light, foldable feel. The coating lets rain, sweat, and splashes bead and roll off the surface rather than soaking through, and the glossy finish wipes clean easily, which is why it works so well for wet, sandy, or sweaty gear. Whether you call it a waterproof cinch bag or a waterproof sackpack, the same 270-denier impertex shell carries across every color in the range.
Can I add my own logo or print?
Yes. Alongside the blank packs, every color is available as a custom version with a multi-color print, so teams, clubs, schools, and events can add their own design. Ordering is flexible with low minimums, making it practical for both small batches and larger group orders. Browse the custom options in turquoise, red, and the rest of the color range to see how a printed pack looks.
Ready to keep your wet and dry gear apart?
A water-resistant impertex cinch sack is the simplest upgrade to your gym, pool, beach, and rainy-day routine, and flexible minimum order quantities mean you can buy one for yourself or print a batch for your whole team. Pick your color, choose blank or custom, and seal the wet gear away from the dry stuff for good.
Shop Waterproof Drawstring Backpacks
Pick your color and keep wet and dry gear in their own corners. From everyday black to logo-ready custom packs for teams, there is a water-resistant option for every routine.
Shop Waterproof Drawstring Backpacks