/ Rucksack problems
I used to have a rucksack that did this (still have it actually). I fixed it by putting a piece of webbing tape a few inches long through each buckle, effectively tightening the buckles' grip on the straps.
So double the excess strap back upwards through the top part of the buckle.
This is a common but random problem and has all to do with the release angle of the buckle which can be affected by the way the rucksack sits on you. The best way to fix this is to apply McNett seamgrip to the few cms where the strap is most likely to be running through the buckle. This significantly increases the friction and should fix the problem for you.
Nope, the best way is to double the strap back up through the top part of the buckle.
No mess, no stickyness,fully adjustable. Simples.
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