Had a look at their website and wasn't impressed. First thing you see is pic of the product and an an add to shopping basket button, no info about the product, how it worked, what is its USP, nothing
The picture is a video - click it & you'll get all the info you need
3kg Cabin Luggage 4kg Checked In Luggage
Seems a bit heavy. what ryaniar's carry on limit 10kg? thats 30% of your allowance in an empty bag. Maybe just pop it on the scale before you leave home.