Most of us are commuting to work all the time and we have to bring things to work so, we need something convenient to carry all our gear! The eloop B1 is a compact 16-litre backpack with a trendy design that you can show off in a coffee shop, commute to work and on the job.
The exterior shell of the B1 backpack is made of 100% polyester fiber, which is naturally water resistant but not waterproof unless, a chemical coating is applied on to the fabric. Most waterproof backpacks have a DWR coating or PU coating applied at the factory. The other alternative to making a non-waterproof backpack waterproof is with a rain cover, which some backpacks are supplied with.
The eloop B1 backpack doesn't come with any waterproofing coating (DWR) or rain cover but the B1 backpack is still waterproof. According to eloop, the B1 backpack shell is waterproof, which means the backpack should be able to handle rain downpours.
How eloop has managed to make the B1 backpack waterproof without any water repellent coating is a bit of a mystery but it seems to come down to the strong, close knit stitching of the polyester fibers.
Without waterproofing coating, you won't have to worry about the waterproofing wearing off every time you wash the backpack. Eloop also offers a Lifetime Guarantee for the workmanship of the backpack, which further strengthens buying confidence. Lifetime guarantees are hard to come by since most manufacturers typically offer anywhere from 1 to 5 year warranties.
The B1 backpack's internal lining is also made of 100% polyester fiber. It's hard to tell whether the polyester lining has the same stitch pattern as the outer shell but 100% polyester lining fabric alone is a major plus because many backpacks use regular bag lining fabric, which isn't as durable.
The eloop B1's polyester lining has a soft finish with a neat honeycomb pattern throughout (including the side hinges,) which secure the front of the backpack in a fixed open position so, the contents don't fall out of the bag.
The eloop B1 main compartment zips open about three-quarters of the way, which makes sense since the backpack's side hinges aren't detachable anyways.
Inside the eloop B1's main compartment, you find a 15-inch laptop sleeve and a tablet sleeve big enough for a 10-inch tablet.
There is also two organizational pockets and two pen holders, as well as a small zip compartment to secure valuables The laptop and tablet pocket sleeves are secured via a velcro strap.
The eloop B1 also integrates metal accents, including the front logo and zips, which are made of 100% ferromanganese alloy. The pull tabs seem to be made of TPU because of the soft, silicone finish.
The grab handle on top is superbly stitched up, integrating foam padding for comfort. The eloop B1 backpack padding is made of 100% polyethylene (PE) closed cell foam, which provides good overall support for carrying loads.
Because the eloop B1 is a small backpack that is not designed for carrying heavy loads, closed cell foam is more than adequate although when it comes to foam padding for backpacks, closed cell foam comes second to EVA foam, which is the best type of foam padding to use on a backpack because EVA foam is denser and springier.
Most backpack padding is either made of closed cell or EVA although some backpacks are made with open cell foam, which is not the most suitable type of padding.  You definitely want to stay away from heavy-load backpacks using open cell foam padding. The dimensions of the eloop B1 backpack are 30cm long, 14cm wide and 44cm high.
The backside of the B1 backpack features a single piece of closed-cell foam padding covered in breathable mesh, which is nice but without air channels on the back, ventilation isn't as efficient. On the backside, you also find a trolley pass through sleeve and a fairly large secret zip pocket.
The shoulder straps are made of the same closed shell foam and feature easy-to-pull adjusting webbing with plastic retainers to fix the shoulder adjustment in place. The end of the shoulder strap webbing is reinforced with extra stitching to prevent the webbing coming undone.
The eloop B1 backpack also comes bundled with a powerbank and aluminium bluetooth speaker. The eloop E36 powerbank has a smooth aluminum enclosure with a rated capacity of 7,400mAh and cell capacity of 12,000mAh, using lithium polymer batteries.
It's useful that eloop provides the power bank rated capacity because most power banks don't show this rating, which is important because the advertised mAh capacity of power banks is rarely what it is claimed. Power banks use 3.7 voltage batteries, which the circuitry inside power banks then, converts to 5 volts, which is the voltage output of all USB power banks.
Even if the rated capacity isn't shown, there is a formula to calculate the rated capacity. You simply times 3.7 (voltage of the battery) by the advertised mAh capacity and divide it by 5 (i.e. 3.7 x advertised mAh / 5). The E36 power bank recharges via micro USB connection, as well as USB-C connection, which is rather neat because most power banks use one or the other. You cannot use both inputs for recharging the battery though. The power bank charges fully in 6 hours approximately, using a 2A charger.
Both the USB and USB-C ports in the E36 power bank can handle fast charging at 5V and 9V. The USB ports can handle standard 10W charging (5V/2A) and 18W fast charging (9V/2A). The USB-C port delivers 12.5W (5V/2.5A) and 18W (9V/2A).
The eloop E36 power bank is also able to charge devices at fast charging speeds via two USB ports (5V/3A, 9V/2A and 12V/1.5A) and the same USB-C port used for recharging the powerbank. This is one of the advantages of  USB-C over microUSB, which isn't capable of bi-directional charging. The USB-C port has the same fast charging output as the USB ports.
There is a power button on the front of the power bank for turning on the leds and show how nuch battery is remaining. When all four leds lit up, it means more than 75% battery is left. When no leds lit up, it means less than 15% battery is left. As mentioned earlier, the eloop backpack is part of the flyer bundle that also includes a powerbank and portable speaker. All three items can be bought separately too.