90% waterproof

The Semptec backpack at a glance:
- Weight 1.1 kg (unfortunately missing this information from Amazon)
- Average processing threads at the seams
- Broad straps
- Abdominal belt narrow and short plenty
- Slight plastic odor, but not annoying for me
- Sufficiently waterproof for most outdoor activities, but not 100%

The Semptec waterproof tracking backpack is basically a dry bag with shoulder strap. He is 77 cm high and has 45 cm in diameter. Through the rolling shutter about 48 cm can be used at height. And that makes 76340 cm3 or 76 liter usable volume! My photo backpack with its 45x35x20 cm I get into it (at 2 cm diameter at more Semptec would go more easily), over there is still room for a towel and a spare t-shirt.
The risers are attached to a 35 x 25 cm large Meshstoffstück which in turn sewn to a piece of tarpaulin, which in turn is bonded to the rest of the pack. Because hopefully not traveling too fast when the backpack is well filled.

The wide straps and lightly padded 6 cm, not as strong padded like a good photo backpack for short trips but adequate. The waist belt I can but in the farthest position close just so - and in clothing size 54 without big belly. Processing I would describe as tidy but not as high. At the seams many threads. The two-color design quite a lot of parts that are sewn together as / glued. In a plain backpack fewer seams would have been necessary.

The buoyancy is neat, with 11 kgs of Semptec drives on the water. It should be clear, a 70 liter backpack should weigh more than 70 kg in order to go down ...

The rolling shutter or 5 times 6 times I can change suddenly (ie 2.5 and 3 revolutions). Press I then the backpack together, then I hear escapes at the ends of the rolling shutter air. Likewise, if one pushes him lying under water, then bubbling the air out. Then also a lot of water is in the backpack.

I drew him eingie days later at the lateral loops in a water barrel with water. As long as only the center of the rolling closures come under water, everything is fine. Dip the ends under, bubbling air out and it penetrates water. Not as much waterproof as in my first attempt, but 100% of the backpack's just not.

I have a 10L Ortlieb packsack that goes this air escape through not squeezing. The material is softer and more supple than the Semptec. Underwater pressed, but also come here air bubbles at the ends out, only smaller.

Conclusion:
A heavy rainshower survives the content certainly without prejudice in a Semptec. And by breast high water you can therefore move. Completely submerge - ie in jumping into the water or capsize a canoe - should not the backpack, if possible. Given the low price 5 Stars.