While I do somewhat agree in that they seem to make a big deal out of something which has been done in many ways by many people for many years already I do have

While I do somewhat agree in that they seem to make a big deal out of something which has been done in many ways by many people for many years already I do have to point out that these types of practical DIY projects are far more useable than any factory-made bike bags. They fit more stuff, they are cheaper and if they ever get damaged or destroyed you simply make another one/pair instead of having to buy something new. The fancy presentation of this project/product fits with the 'cycling for the planet' crowd while the actual concept of strapping a pair of 25l cans to the carrier is more in line with those who use their bikes because that is just what they've always done without any thoughts of 'enough' or 'climate' or 'environment' or 'virtue'.