I used Pakible to order some custom cardboard boxes for one of our company's product offerings. The box customization was extremely user friendly and super easy to use. Ideally I'd like some more options, but given its ease of use it makes sense that they have to limit for advanced customization options.
Customer service is really great, both in response time and friendliness. It's probably the main reason we'll stick with them for our custom cardboard box needs, despite the slightly higher price of their product. But again, since we're ordering low quantities, I doubt we could do much better elsewhere.
Keep being great, Pakible!