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This is one of our favorite reviews that we have recently updated and refreshed. Sea to Summit still makes this award-winning bag and we can understand why! It’s one of our travel favorites!
One of the things I ALWAYS pack on a trip is a durable, stuffable daypack. With the ability to collapse into the size of a pocket or hand-sized pouch, they take up virtually no room but offer all the convenience a space-conscious traveler wants.
Have a little less stuff? Just cram this bag into your bigger backpack and forget about it.
Buy too much? Heading out for a quick walk around town? Pop open your daypack and you have an easy, light bag ready to go!
Yes, I LOVE stuffable bags, especially daypacks, but it wasn’t until Sea to Summit delivered a sample of the Sea to Summit Ultra-Sil Daypack to me that I knew how much.
Why I Love the Sea to Summit Ultra-Sil Daypack
This bag PACKS UP SO SMALL! I mean… just look!

It’s so tiny you can justify snapping it on a keychain or tossing it in your smaller purses. Honestly, part of the reason I enjoy this bag so much is because I just like showing people how it stuffs itself into this adorable little pouch.

But, that’s not all:
- This stuffable daypack is made of siliconized nylon – the kind that doesn’t rip or tear.
- It’s durable enough to handle everything from groceries and books to a few pieces of electronics.
- It weighs nothing (just 2.4 ounces).
- It holds 20 liters.
I used this daypack quite a bit on the Silk Roadistan tour earlier this year. Sure, I had my super awesome PacSafe SlingSafe daypack for my main travel days, but that wasn’t always needed.
A quick walk around the ger in Mongolia, where I just wanted a bag to hold a bottle of water and a jacket, called for the Sea to Summit Ultra-Sil Daypack. As did a quick visit to the shops for food and beverages.

And, with its great unisex qualities, even Pat wore it around here and there.

My One Complaint
My main gripe with this cute stuffable daypack would be the lack of an extra pouch or zippered compartment. I would have loved a front pocket to toss in smaller items instead of being forced to throw them all in the single compartment.
Besides that, the Sea to Summit Ultra-Sil Daypack makes for a great addition to any female’s packing list!
More Sea to Summit Stuffable Bags
While I love the Ultra-Sil Daypack, Sea to Summit has other great stuffable bag options available.

There is now an Ultra-Sil Nano Daypack option that packs down to the size of an egg (as opposed to the size of a tennis ball), weighs 1oz, and has an 18L capacity.
Sea to Summit also has a packable shopping bag available in both a regular size and a nano size option. They are both made from Ultra-Sil material.
- The Ultra-Sil Shopping Bag weighs 2oz and has a 30L capacity.
- The Ultra-Sil Nano Shopping Bag packs down to the size of a golf ball and has a 25L capacity.
Lastly, Sea to Sumit has a stuffable Ultra-Sil Dry Day Pack which is waterproof and ultra-lightweight with a compression lacing system on the front.
- Check out our review of the Sea to Summit laundry and washing products.
Sea to Summit Ultra-Sil Fabric
What exactly is Ultra-Sil fabric?
According to Sea to Summit’s website, Ultra-Sil is an incredibly lightweight yet durable nylon made with Cordura yarns for strength woven into a ripstop pattern. Two versions of the fabric are used:
- Water-resistant products are siliconized on both sides for ultimate packability.
- Waterproof products are siliconized on the outside and PU-coated on the inside to allow seam taping.
Ultra-Sil fabric is used in a large number of Sea to Summit products.

Here are some more examples:
- Ultra-Sil Nano Poncho
- Ultra-Sil Dry Bag
- Ultra-Sil Trekking Umbrella
- Ultra-Sil Compression Sack
- Ultra-Sil Stuff Sack
- Ultra-Sil Pack Cover
Do you take a stuffable daypack with you on your travels? Do you have any Sea to Summit Ultra-Sil products? Let us know in the comments below.
*This daypack was provided free of charge by Sea to Summit, but I honestly love it and use it regularly on my travels.
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This looks to be one of those items that you can live fine without, but once you have one you use it all of the time. I can think of so many situations in the past year where this would have come in handy.
The stuffable daypack will definitely be going on my Christmas list!
Thanks for this review, this was exactly what I was looking for and I got one last weekend and have already used it a couple times. It will be great for my Costa Rica trip in May for carrying a light rain jacket or umbrella in while out and about because you just never know what it’s going to rain! Thanks again 🙂
I love this thing. I got one after reading this and am so happy about this purchase. I have used it so many times in the month or so that I have had it. It lives in my purse and gets pulled out for groceries, other shopping, day trips, library adventures, and unexpected book loans from friends. My boyfriend thinks it is the coolest little gadget too and is excited to get one of his own.
This looks awesome! I got a similar product, from North Face’s Summit Series, that’s 26L. I’m trying to move away from traveling with backpacks, using a purse, but there are so many occassions when a backpack is the best choice for hikes, nature walks, day trips, laundry, market trips, etc…. Plus it can really save your back!
I had this exact bag until I accidentally left it in some Peruvian hostel. The packed size was spectacular, it carries a lot, and it’s a lot tougher than it looks, but when I decided to replace it I got a ChicoBag daypack instead, which has the extra pockets and is only slightly bigger when packed. I still miss it sometimes, though.
I took this bag on a trip to Europe last summer and while it was handy in all the ways already mentioned, I would not recommend it in hotter climates because the material was not breathable and actually seemed to trap so much heat between my back and the fabric (especially where my bare shoulders were touching it). It was a literal sweat-factory.
Also no padding in the straps at all so not very comfortable with heavier loads.