Very likely that this was a family owned business, but I couldn't find anything online as well. It probably shut down in the 90s or the 00s, as a lot of European textile industry moved their production into cheaper parts of the world, with whom local shops and factories couldn't compete. It was also a time, when local Slovenian production lost its home market, with the end of Yugoslavia, and the yugoslav wars.. so it was even harder to survive for such types of business.

Lendava is a bilingual town, where both Slovenian and Hungarian are official languages. But "Novak" is very much a slavic lastname, where nov means new, and -ak implies that it is a person, so like a "new guy in town". It is a very common lastname, also in other countries, so it is hard to find anything about this backpack in particular, even tho Lendava is a small town. I only found one expired ad, of someone selling a hiking backpack from the very same brand, so it looks like it did in fact exist, but nothing else unfortunately.

"športni izdelki iz tekstila" translates to "sport products (made) out of textile". If you were wondering.

Your best bet is to fix it yourself.