He says: I was very impressed by the theme used for the Ei01 Solar Backpack. Everything is well thought out. The solar panel is positioned exactly where it can capture most of the sun's light and the use of muddy colors will prove useful, since backpacks usually get pretty dirty over time and not many people take the time to drop them at the dry cleaners, given that they use them every day and all that.

The inside of the Ei01 could have been of a darker orange, since I'm not that comfortable with that bright (almost fluorescent) look. But, all in all, I have to say it's a good looking accessory. With one exception. That blue-marine solar panel has a tendency to ruin the overall theme, but not by much.

She says: Using a flexible solar panel which seamlessly melts into the bag's design gives the Ei01 solar backpack from o-range the sophisticated travel look. The many compartments and pockets within the backpack allow a well-structured organization of all your stuff, easy to find back without turning the bag upside down.

The excellent workmanship makes the Miles Solar Backpack more like a piece of art among ‘ordinary’ solar backpacks and the combination of colors (earthy khaki and bright orange) compliments the structure and seaming of the backpack even more, not to mention the fact that they actually manage to blend in the blue color of the solar panels.

He says: You might not think that much about a backpack's list of features, but bare with me when I say this one doesn't stand shy of tricks. One of its most innovative features is the COCOON System. This uses thermo-molded shields so that the shape of the backpack is maintained over time and the wearer doesn't experience any discomfort caused by the contents of the bag. The shields provide almost no extra weight so there's no downside for this solution.

She says: If you think that the Ei01, also dubbed Miles, is all about design and nothing more, you'd be dead wrong, because the Miles backpack has so many things to offer that you will pretty soon consider it your best friend. Besides the already mentioned solar panel that allows you to charge your gadgets while on the go and the COCOON System, which clearly differentiates it from other backpacks in the same market segment, the Miles backpack is also computer ready, features a designed headphones hole, provides numerous functional pockets and is water repellent.

Also, it features very comfortable EVA paddings, placed where the backpack is in contact with the body, which create transpiration channels, provide improved breathability and enable heavier loads to be carried for a longer period of time.

He says: While I'm not sure how much power the backpack can store, I'm trying to look at this from a different angle. I mean the backpack is targeting rather active people which mostly spend their day roaming the city, so it's really an ongoing process that goes on while you wear the Ei01. Energy is continuously being transferred from the solar panel to the internal battery and finally into your portable gadgets.

But still, the fact that when you travel you usually want to get somewhere, and that somewhere is usually a building of some sort, you're left with no sun. On the subway...no sun, in the car...could be sun, taking the train still a no go. So in reality there are pretty much only a few situations in which such a bag would prove useful. And I really don't think there's anyone who travels a city all day long by foot with the sun on their tail.

As a backpack, the Ei01 is pretty capable. It features special mp3 and mobile phone pockets, quick strap adjustment and provides for a very comfortable carrying experience by use of the EVA paddings. Headphone's support is also on the list. Rain will not ruin the looks or damage your precious gadgets because the Solar Backpack is water repellent.

She says: The many compartments and pockets at the inside of the backpack allows a well structured organization of all your stuff, easy to find back without turning the bag upside down. A battery pack with load indicator keeps on sucking up all the energy the solar panel collects and a wide range of different tips guarantee that any and every of the common electronic devices can be connected and charged.

This unique backpack has an interior padded PC pocket that can safely hold a 15.4-inch laptop. This pocket is detached from the bottom of the bag in order to prevent vertical shocks. It is ideal for devices like cell phones, MP3/MP4 players, digital cameras, PDAs, DVD players, GPS systems and so on.

He says: You don't have to be a genius to understand how the Ei01 works. Sun light hits the solar panel, the battery inside the pack gets charged and provides electric current for your gadgets. There's even a button which when pressed lights up 1, 2 or 3 LEDs so users can estimate how much power is left in the container.

The stupid thing about the internal battery is that it only provides 6 adapters for different gadgets, two of which are USB (mini and regular), two are used for Nokia phones (regular and slim connector), and the last two compatible with the iPod (it would have been really dumb o not include an iPod adapter) and Sony Ericsson phones. Considering the fact that there are still tons of gadgets that don't support USB charging, this is a pretty restrictive list and will render the whole feature useless for a lot of people.

Besides that, there's really nothing more to know. If you know how to use a regular backpack you'll have no trouble at all with this one.

She says: When it comes to Miles' user-friendliness, there's actually nothing to say, because all you have to do in order to benefit from its features is treat it like a regular backpack, put it on your back and stuff things in it. That's basically all you have to do, as it will do the rest for you and your gadgets.

He says: Interesting question. Priced at a little above $300 (305 to be exact), I would have to say o-range is kind of stretching it. I mean it is a great backpack, made of high quality materials and fitted with a lot of detailed features which really make a difference at the end of the day when you are tired. I'm confident that the quality factor will also stand out over time, but the whole solar power nonsense is greatly overrated. I mean if the whole energy independent gimmick is affecting the price, then I'm sorry, but I have to urge o-range to make a replica without the solar feature.

She says: Taking into consideration that most bags and backpacks that feature solar panels retail within the same price range as the Miles, and that most of them aren't actually as full-featured as this piece, the Miles backpack sound like a pretty good offer.

He says: I wouldn't exactly say it's cool. Don't really now why. I it has a solid-modern design, it uses a conservative theme and in the big picture it looks great. It's not for the geeky gamer or for the “I'm- carrying-my-entire-house” type, or even for the business class, but it has something to it that I just like. I think it has to do with the non-imposing colors. Whatever, bottom line: I'd be pleased to use it.

She says: This is definitely a cool backpack. It would be just as cool even if it didn't have the solar panel, but that's definitely a plus. Just think that with this backpack you get comfort, efficiency, style and you also get to be an eco warrior.