Attention AT lovers, if you want to take the panel on a hike then this is it. First the reason for 3 out of 5 stars. One simple reason, it's described as a 10 watt solar panel. No, that is not so. The maximum I recorded (from multiple tests) was around 3.5 watts. It's a 5-watt panel, not a 10-watt panel, and that's generous. This is the reason for the lower rating. If this company changed the description from 10w to 5w I would give it all 5 stars. As a 10w panel it's 3 stars but a 5w panel is 5 stars. The final downside is the USB port, which others have covered up. Presumably due to the glue used, it comes off easily as the panel heats up. I can't vouch for this because as soon as I got it I put super glue around the USB connector and no matter how hot the panel is it's stuck there. Now for all the pluses, and there are a lot of them. First, it appears to be very well constructed. It is durable and very light. Second, the total weight of the panel without the charging cable is 2 7/8 ounces. Yes, less than 3 oz and that's it, so I recommend it for AT lovers. ultralight. Even when I added some super glue around the USB connector it didn't affect the weight. Another 2 7/8 oz. Thirdly, although its maximum power is only 3.5W, it is enough to keep the phone charged. I estimate that 3.5 hours in the sun with this panel will fully charge my phone. It can charge a 5000mAh battery in 5.75 hours (enough to charge my phone 1.7 times) and a 10000mAh battery in 11-12 hours. I recommend the battery. Do not charge your phone directly from the pad as the charge fluctuates all the time and I would not recommend this for a phone battery. Let a regular $10 5,000mAh battery do the work and protect your phone's battery. Fourth, the price. 20 dollars. A well-made 5W panel is definitely worth it. For hiking, I use this pad (82 g, 2 7/8 oz), a 10,000 mAh battery (187 g, 65/8 oz), two 12-inch braided charging cables, a micro USB cable, and an Apple for my iPhone (26 g 7/8 oz). ) as well as a USB power adapter (36 g, 1 1/4 oz) The plug is apparently suitable for city trips and can charge the phone and battery. You need a micro USB cable to charge the battery from the panel, as well as to charge most devices from the battery. I have an iPhone, so I also need an Apple charging cable. The total amount is 331 g or 11.675 oz. It's good to keep your phone charged. I start with a full charge and the 10,000mah battery lasts 3 charges. I can work with the panel for weeks without a phone. If you want to use the lower-capacity 5000mAh battery, that's 1.7 charges and knocks 3 ounces off the total weight (8,675 ounces). If you have a decent sun, this will probably work, too. I attach the panel to the Back of the backpack and I put the battery in my pocket and protect it from the sun with the charging cable in between. In summary, the only issues are the USB port (easy to fix) and being listed as a 10W panel when it barely qualifies as a 5W. It's also affordable, well-constructed, durable, and ultra-lightweight. I would highly recommend this panel, especially for backpackers who are mindful of their pack weight. My only recommendations: use better glue on the USB connector and change the description from 10W to 5W.