Aside from buying nothing or mending what you have, the next most sustainable option is often to buy used. And, if you’re looking to free up space in your home, donating or selling your gently used items keeps them out of your local landfill. Where can you do both? Online thrift stores!

Thrifting is a great way to be thrifty, i.e., to save some cash. It’s also a great way to save resources and cut down on the unnecessary production of more stuff. After all, most clothing is only used a handful of times before it’s discarded, and one person’s fashion trash is another’s treasure.
Fashion is also a huge source of pollution and a massive consumer of water, including water that should be reserved for human consumption. This is why certifications such as BlueSign, Oeko-Tex, and GOTS are so important as they help cut down on pollution and the use of harsh and hazardous chemicals in textile production.
Even where companies are doing better in terms of using more sustainable materials and fewer dangerous chemicals, the fashion industry continues to grow.
There are now more than one hundred billion garments produced each year (twice as many as 15 years ago), which means massive amounts of land devoted to growing conventional cotton and huge amounts of energy going into growing and producing natural and synthetic fibers and shipping these and the end products around the world.
Then, at end of life (which may be after just one wear!), 73% of apparel is sent to landfill or incinerated, according to ThredUp. Horrifyingly, 95% of that could have been reused or recycled. ThredUp also notes that buying just one item used reduces CO2 emissions by an average of 25% per wear.
Here are some of the best online thrift stores in the U.S. that offer a great experience for buyers and sellers looking to be more sustainable.
Our top picks

ThredUp
Highlights: Arguably the biggest online thrift store for women’s and kids’ clothing, with more than 2.4 million items listed and nearly 100,000 added daily. High fashion and more affordable wear, with easy buying and selling. ThredUp is also super transparent and clearly committed to reducing fashion waste and making clothing more sustainable.
Fed up with unsustainable fast fashion? Check out ThredUp, a fun online thrift store with mostly women’s and kids’ secondhand clothing and shoes, and some bags and purses. ThredUp carries more than 55,000 clothing brands including high-fashion items and more affordable, everyday wear. You can score a huge bargain at ThredUp, with some items priced at 90% off retail. There’s also a great collection of more than 4,000 items of maternity wear.
How does ThredUp know this? Because it commissioned its own lifecycle impact report as part of its advocacy and education remit. ThredUp also offers a carbon clothing calculator, so you can estimate the impact of your clothing habits on your environmental footprint.
If you’re really just looking for cool clothes, though, you’ll want to check out ThredUp’s ReFashion range. This entirely upcycled clothing collection is made using secondhand garments and fabric scraps and is designed by Zero Waste Daniel.
Note: ThredUp only ships to the U.S. and Canada (with limited product selection for Canada).

Swap
Highlights: Affordable, gently-used clothing for all genders, ages, and sizes with millions of items, free shipping over $75 and 30% off your first order!
Swap has been in business since 2012 and was originally a kids’ consignment online store. It expanded rapidly though and now offers a huge range of clothing and shoes for people of all genders, and for adults and kids. This includes an excellent size range and a huge range (more than 2500 items) of maternity wear.
Swap adds almost 20,000 new items daily and there are currently more than two million unique items listed on Swap.com. This includes some high fashion items (at a huge discount) but mostly just good quality gently used affordable apparel.
Swap offers free shipping over $99 and 30% off your first order. It only ships in the U.S., though, so us Canucks are out of luck.
Here’s hoping Swap will open up its Premium Seller program soon. In the meantime, this is a great one for buyers.

GoodBuy Gear
Highlights: Gently used baby and kid gear that’s fully inspected and cleaned and sold at a huge discount! Great for sellers and buyers, but only available in a few cities (so far).
What they sell: Strollers, high chairs, car seats, cloth diapers, baby monitors, breast pumps, bottles, diaper bags, and more!
If you’re in the market to buy baby gear, GoodBuy Gear offers quality baby and kid items at up to 50% off retail. Everything is inspected and checked for safety and the company never sells recalled products (a real hazard when buying baby gear used). There’s gear for infants, toddlers, big kids, and adults and a huge variety, including gear for sleeping, feeding, diapering, travel, sports, outdoor, and for home décor.
GoodBuy Gear is a relatively new online thrift store set up to help families buy and sell used baby gear. So many baby items are only used for a short time period but cost a lot and require huge amounts of resources and materials to make. With sites like GoodBuy Gear (and Rebelstork in Canada), you can get some cash back and find a bargain, reducing the cost of parenting both financially and environmentally.
So far, GoodBuy Gear has locations in Brooklyn, NY, Denver, CO, Philadelphia, PA, and Washington, D.C. Not all services are available at all locations though, so check the website. In some locations, the company offers pick-up services. Elsewhere, you can drop off your used baby gear or, if you live outside these areas, consider trading your kid gear in at your local buybuy BABY.

Beyond Retro
Highlights: Bright, fun, retro fashion from the 60’s onwards, with thousands of new items added each week and a Reworked Vintage range of upcycled clothing. Based in the UK and great for all genders!
Missing that must-have fashion item for a 60’s, 70’s, 80’s, or 90’s, costume party? Beyond Retro has you covered, literally. And this fun in-person and online thrift store based in the UK donates 10% of sales to charities.
Beyond Retro claims to rehome more than 90 million items each year, with thousands of new items added weekly to its inventory. Unlike many online fashion thrift stores, this one is not just marketed at women, offering clothes for all genders.
The first Beyond Retro store was housed in a disused dairy in East London and quickly built a reputation with the Brick Lane crowd for selling more outrageous and exciting clothing than the regular high-street clothing store. Over the years, Beyond Retro expanded beyond its Brick Lane roots to open four more stores in London and three other UK locations, plus stores in Sweden and Finland.
Beyond Retro has also gone… beyond thrifting, launching its own range of upcycled clothing as Reworked Vintage (view here). Each piece is unique, with dresses, bomber jackets, crop tops, shirts, and even bags and other items, all made using reworked textiles from Adidas, Nike, Disney, and other vintage brands.
If you’re near to one of the Beyond Retro stores, you can drop off pieces in exchange for store credit!

Goodwill
Highlights: Incredibly eclectic inventory of curated items from participating Goodwill stores, with a fun auction model and all proceeds supporting the non-profit’s charitable mission. Great for collectibles, antiques, and real bargains and exciting finds!
If you’ve been searching high and low for a VHS boxset of Indiana Jones movies, or really need a Vintage 1970s Craftsman 7-Band Portable Radio, online Goodwill may be just the place. Both these items were listed at the time of writing, with prices still under $10 and low-cost shipping on most purchases, with some 1c shipping items too! There are even wedding dresses for less than $20, which would help save money, so you can stretch to buy an appraised diamond ring for $35k.
As you’d expect with any good thrift store, the inventory at shopgoodwill.com includes antiques and collectibles, clothing, home décor, electronics, movies and music, musical instruments, religious items, and much more. Many of these are new, with the rest made up of nearly new items, all curated from the vast inventory of goods donated to participating Goodwill stores.
And, as with all in-store purchases from Goodwill, online sales at shopgoodwill also fund the non-profit’s mission of education, training, and job placement programs for people with disabilities and other barriers to employment.

Poshmark
Highlights: Great for sellers and buyers of modern fashion, with a thrift-store feel and super popular, easy to use app. Some real gems among the more than 200 million items!
Poshmark is a fantastic online thrift store, albeit one that isn’t centrally curated. This means every purchase is a little bit of a gamble as everything ships direct from seller, rather than a warehouse where items have been screened, repaired, and beautifully photographed. Honestly, though, Poshmark feels truer to life, in that the website channels some of that cluttered, treasure-hunting vibe of a real-life thrift store.
Poshmark also encourages haggling, with Poshers (sellers) often listing items at optimistic prices with the expectation buyers will counter-offer. Items include clothing for all genders, kids, and pets, home décor, electronics, bags, shoes, jewelry, makeup, and more. Need a prom dress? Check Poshmark. Need a prom dress for your dog? Check Poshmark.
Not sure exactly what you’re after and need some inspiration? You can search by size and use other filters to discover something new to you.
I’ve used Poshmark a few times in Canada, mainly to source baby clothes and shoes. These are typically expensive to buy new and are often only worn a handful of times, meaning ‘used’ items are almost always in fantastic condition. This was my experience with all my Poshmark finds – perfect near-new quality items that arrived very quickly, with postal tracking, and for a fraction of the price new.
My favorite find was a very cheap pair of baby Vans, for just $7 Canadian, in perfect condition. After a month of wear by my extremely active outdoorsy toddler, these are definitely not in a condition to resell, however!

Swapabee
Highlights: One to watch, this online swap-store and non-profit has some seriously weird items and some real bargains, mostly thanks to its early adopter student users in the U.S. and UK.
Swapabee is on a mission to make stuff more sustainable. A quick look turned up a listing for a pot of English sand (yes, beach sand) for $5, a snowboard, a crystal skull, an e-bike, and seven unopened Lego sets.
Unlike most online thrift stores, Swapabee uses a unique algorithm that matches your swap item to five things it thinks you might like (and where the seller might like your item). This means you can entirely cut out financial transactions and just swap stuff. Or, if your items are valued very differently, you can negotiate adding cash or other items.
Special mention

Goldsmith Vintage
Highlights: UK-based, social justice oriented, innovative thrift store selling vintage clothing and a cool collection of upcycled fashion created by design students!
Goldsmith Vintage is a UK online thrift store that does things a little differently. Here, you’ll find vintage sportswear, bags, dresses, jackets, Hawaiian shirts, band t-shirts, and more. There’s also an option to purchase Mystery Boxes to shake up your style!
Based in the UK, Goldsmith Vintage is LGBTQ-owned and operated and is one of the few thrift stores truly motivated by sustainability and social justice. The company has been around since the 1990s and saves around 30 tons of clothing from landfill each year.
Goldsmith Vintage’s Rework collection features unique items made through its Alter Eco program. This impressive, exciting range of one-off pieces is created by fashion design students using deadstock fabric. Students also get 20% off at Goldsmith Vintage and there’s free UK shipping on orders over 50GBP.
Final thoughts
The bottom line is that fast fashion fills up landfills. Looking for thrifted pieces is a great way to recycle and cultivate style at the same time.