That's been a feature of all rucksacks since release of the original store bought ones. Unlike the store bought ones, however, the crafted ones never break so it's just a visual thing so at least it won't matter much that they can't be repaired. I suppose it might be nice to allow repair using the already existing tailoring repair techniques even though it isn't strictly mecessary.. I wouldn't want a separate tech just for non-armor tailored repair for sure though.