I used to think a double sided hamper was about sorting. Lights on one side, darks on the other. Then I bought one that didn't fit under my bathroom sink and spent a week tripping over it in the hallway. The real problem wasn't sorting. It was my room.
Before you even look at materials or zippers, measure where the hamper is going to live. Not just width and height. The path to get there. My hallway is 28 inches wide. The hamper I ordered was 24 inches wide with handles sticking out. It fit, barely, but I had to angle it through the door like a couch.
Think about the floor space. If you're putting it in a bedroom corner, you've got more room. But if it's in a bathroom or a laundry closet, every inch counts. I've seen people wedge a 26-inch hamper into an 18-inch gap. Doesn't work. Measure first.
Then think about height. The whole point of a double sided hamper is to toss clothes in without bending. I'm 5'10". A 32-inch tall hamper is fine. My wife is 5'2". She has to lift her shoulder to get clothes in. That's annoying at 10pm when you're tired. If you live with someone shorter, get one that's around 28 inches or has a lower opening.
The second constraint is the lid. Some double sided hampers have one big lid that covers both sides. That's a pain if you want to put a dark shirt in while the light side is full. You're lifting a heavy flap every time. I switched to one with two separate lids. That was the right call. Each side opens independently, so no wrestling with a giant slab of fabric.
Now the honest part. Most double sided hampers are made of canvas or polyester. They're cheap and light. That's fine if you're not overstuffing them. But if you're using it for a family of four, the seams will pop in six months. I know because I went through two. Look for reinforced stitching and a frame that's not just thin poles. Some have a metal or wooden base that keeps the shape. That's worth paying extra for.
Also, consider how you're going to move it. The ones with built-in handles are easier to carry than the ones with just a drawstring. And if you have stairs, get one with a shoulder strap or at least two solid handles on the sides. I haul mine down to the basement once a week. That's a lot of lifting.
Let's talk about the actual sorting. A double sided hamper works if you do lights and darks. But if you wash everything in cold water, it's pointless. You're just carrying more weight. I know people who use one side for towels and the other for clothes. That's smarter. Think about your own laundry routine, not the marketing.
I also learned the hard way about the smell. A fabric hamper with no ventilation gets musty fast. Look for one with mesh panels or vents. I had one that was solid canvas and after two weeks it smelled like wet dog. Not great. Also, if you have wet towels, dry them out before tossing them in. No hamper fixes that.
If you're still reading, here's my blunt take. The double sided hamper is a nice idea but it's not for everyone. If your room is small or you have to traverse a narrow hallway, it's a pain. I stuck with mine because I figured out the right size and lid setup. But the one factor that decides whether this works is your room's width and height. Measure it. If it's under 20 inches wide, get a single tall hamper or a hanging one. Don't fight the space.
I still think it's worth it if you have the space. Sorting at the point of drop-off saves me time on laundry day. No more digging through a pile to find the darks. But I wish I'd measured first instead of guessing.
For more, check out my take on setting up a 2 sided hamper: Setting Up a 2 Sided Hamper: Week One Lessons I Learned the Hard Way. If you're on a budget, here's what I learned about IKEA hampers: IKEA Laundry Hamper: What $10 vs $40 Actually Buys You. And if you're thinking about a three-way split, read this first: 3 Divider Hamper: Measure the Doorway, Not the Catalog Photo.
Bottom line: measure your room, think about your laundry habits, and don't overpay for a brand name. The right one for you is the one that fits your space and your routine, not the one with the best photos.