This is a review of the Sea to Summit Ultra-Sil Day Pack, which I bought from as part of their affiliate program. The pack retails for $79 and weighs only 2 oz without its included rain cover.

The Sea to Summit Ultra-SilTM is a little daypack with a big personality. This bag makes up for its lack of organization with its durability and packability. The Ultra-flexibility Sil’s to bulk out and pack down makes it an excellent alternative for folks who often exceed the carrying capacity of their day pack.

Aesthetics and Materials

The “Ultra-Sil” designation comes from the 30D siliconized Cordura® ripstop nylon used to make this 20L pack. Sea to Summit utilizes lightweight, water-resistant Cordura and weaves it into a ripstop pattern before coating it with silicon to make it more packable. While not completely waterproof, the Cordura in the Ultra-Sil has a hydrostatic head more than 2000mm, which is a fancy way of stating it’ll keep your belongings safe from water.

Sea to Summit Ultra-Sil Day Pack Cordura Close UpTo put it bluntly, this bag will not win you any fashion awards. The “trail-ready” aesthetic, like with most Sea to Summit items, is better suited to the actual jungle than the urban jungle. We went with the green pack, which surprised us since it was less vivid than the vibrant green hue represented online. The Sea to Summit insignia is set off by a vertical gray accent stripe, which isn’t exactly subtle—but then again, this purse isn’t meant for the Met Gala. A little badge on the Bagalkot advertises the Cordura material, in case your friends inquire what your pack is made of… (Okay, maybe that’s just a typical Pack Hacker inquiry.) The rest of the group is black, which is a great way to hide dirt and other stains. When looking at the pack up close, the rip-stop weave is also evident, which we like but other people may not. When you first unpack the Ultra-Sil, it will have an important wrinkle, much like other packable products. After a few hours of usage, we’ve seen that it usually irons itself out.

When the clamshell is opened, the little compression pouch (attached to the interior of the clamshell) has the same appearance as the bag, with some more prominent branding on the bottom.

Components from Outside

Let’s get right to the point: there aren’t a lot of bells and whistles on this device. That’s not a negative thing! A good daypack should be essential and carry just what you need for a day on the town.

The straps are 12 inch adjustable nylon straps that are constructed of the same material as the rest of the bag. The broader top straps, although not cushioned, do an excellent job of distributing weight and are incredibly simple to adjust on the fly when you want to move the pack higher or lower on your body. Although the tiny adjusters seem to be weak, they operated well, even when cranked on with a bit more force or speed.

You won’t be able to find a fast grab pocket or a spot to keep your water bottle if you’re seeking for one. The only other exterior feature on this pack is a little nylon loop at the top, which is the only other external element apart from the main clamshell. This loop has only been used a couple of times to air out the pack after a little shower and keep it off dusty floors.

Sea to Summit Ultra-Sil Day Pack

Inside the Bundle

The main clamshell opens nearly the entire length of the pack and includes durable two-way YKK zippers, making it simple to access on the fly. You’ll discover a large room to keep all of your belongings after unzipping the clamshell, and that’s all. The Ultra-Sil has no organization—no mesh pockets or distinct compartments—just a big bag where you can put anything.

The Ultra-Sil could fit a full-size DSLR (within a protective case), a 32-ounce water bottle, a tiny first-aid kit, a day’s worth of spare clothes, two travel towels, three peanut butter and jelly sandwiches (#hungrytravelerproblems) at its maximum capacity.

Although it can contain a lot, it should be noted that there is no cushioning. You’ll need to hire some extra insulation (as we did with the DSLR) or be more smart with your delicate item placement. You’ll also want to be cautious with sharper-cornered things, packing them toward the center to prevent back pokes (unless you’re like that).

The beautiful tiny compression pouch is fixed to the clamshell’s lining to put your bag inside while not in use. In addition, it has a convenient small cinch band to keep everything kept in securely once compressed.

Testing and Durability

If you’ve been underwhelmed by the bag’s description so far, here is where we aim to persuade you otherwise. The simplicity and longevity of this pack, despite its modest form, are its defining features.

The Ultra-Sil is practical since it packs down to the size of a fist and doesn’t require three hours and four people to assemble (as sleeping bags do). This device is very simple to pack; clip it onto your bigger pack (or pocket o even your keychain) and go.

However, you wouldn’t purchase a day pack simply because it’s simple to stow, so let’s talk about how tough this bag is. We’re not going to lie: when we first looked at this bundle, we were skeptical. Expect dreams of the Ultra-Sil cracking and leaving us humiliated as other passengers see 50 Shades of Gray and a fingerprint-streaked image of our 2nd grade crush fall to the ground. Thankfully, this was not the case, and we could keep all of our guilty pleasures securely inside.

Sea to Summit Ultra-Sil Day PackThe Ultra-Sil proved surprisingly comfortable for extended amounts of time, despite its lack of cushioning. While using the pack, we did experience some rain—not torrential rain—but the Ultra-Sil kept everything dry as we moved from place to place.

Our main criticism of this bag is its complete lack of organization, while we acknowledge that adding more compartments will inevitably reduce the bag’s extraordinary packability. If Sea to Summit could work it out, we’d love to see a single quick-grab pocket added for those times when our lips ache and the ChapStick is buried among the rest of our gear.

You may enter into the Ultra-Sil game for a reasonably low price when it comes to pricing. It’s neither the cheapest nor the most expensive packable day pack you’ll find, but we believe it’s priced moderately for the quality of the bag. In addition, Sea to Summit provides a lifetime guarantee for any problems that arise while the device is used for its intended purpose. However, we’ve heard varied opinions about their warranty procedure online, so we won’t put our money down just yet.

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