The $20 Gap Filler That 'Perfectly' Transforms Two Twin Beds Into a Seamless King Mattress, Bringing Comfort and Versatility for Guests

It's a clever way to maximize your guest space, and shoppers love it

A bright, maximalist twin bedroom with red beds, colorful bedding, patterned rugs, wallpaper, upholstered chair, and side table. There's a large wooden wardrobe, and windows to the back left corner.
(Image credit: Future / ALECIA NEO)

Hosting loved ones overnight stays is often joyous, but the logistics of making your guest bedroom work for everyone, from couples to grandchildren, can be somewhat challenging.

Or at least, it was. With the Fix The Gap Foam Bed Bridge, available at Walmart, two single beds can seamlessly be turned into a luxurious king-sized mattress, making your guest bed suitable for any person (or pair) that's stopping the night over the summer or later this year as hosting season kicks into gear.

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Shoppers Love This $20 Mattress Gap Filler for Versatile Hosting

All prices were correct at the time of publication, and refer to 'queen' sizes where relevant.

I've spent my fair share of nights on two single beds loosely joined together with a fitted sheet to make a 'double,' and if there's one word that springs to mind, it's uncomfortable. There's something about that gap between the mattresses, which inevitably grows ever wider as the night wears on, that seems to swallow you up, and any efforts to avoid it are, more often than not, futile. That's where the Fix The Gap Foam Bed Bridge, available at Walmart, comes in handy.

Its simplicity only adds to the cleverness – and the low price tag. Simply pop it between two twin mattresses, and it bridges the gap between them, creating an expansive sleep space that won't drift apart in the middle of the night.

For that reason, it's not just suitable for guest bedrooms, either. Using one could also help you avoid a sleep divorce if you share a bed with your partner, but have different firmness preferences. Simply buy the ideal twin-sized mattress for you and your partner, and put this between them for a seamless, comfortable look and finish.

What Shoppers Say

You can also use the mattress bridge, as one review from a verified shopper, 'MariaS' highlights, with chaise cushions.

'Totally worth it,' they say. 'I have been wanting to turn my two-pillow chaise lounge into a comfy “extra” bed, as the two-pillows made it slightly uncomfortable. This “gap” wedge did exactly that, and now the chaise lounge is super comfortable.

'I used the wedge and a mattress topper and cover along with [a] comforter...Forget 5 stars, definitely a 10-star product.'

Another recommendation, from Anita, adds, 'This T-shaped sponge really does a good job filling in the space between my two twin beds,' while a third, from Daisy, echoes, 'This worked perfect[ly]. It lies flat between the bed.'

More to Shop

Make any guest bedroom the envy of anyone who comes to stay with my selection of six sleep space essentials below. From our best on-test mattress for guests to my favorite bedding sets, these items are sure to make this lesser-used room feel elevated, premium, and, most importantly, impressively comfortable.


Knowing what makes a guest bedroom look dated will ensure yours always looks stylishly bang on trend.

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Ottilie Blackhall
Sleep Editor

Ottilie joined Homes & Gardens in 2024 as the News Writer on Solved, after finishing a Master's in Magazine Journalism at City, University of London. Now, as the Sleep Editor, she spends her days hunting deals and producing content on all things sleep – from mattresses and sheets to protectors and pillows, all of which she tests in her own home. She also has particular expertise in home fragrance, covering everything from candles to reed diffusers.

Previously, she has written for Livingetc and Motorsport Magazine, and also has a Master's degree in English Literature and History of Art from the University of Edinburgh, where she developed a love for inspiring interiors and architecture.