"zipper pull with LED light, compass, and thermometer"
You had a clue when you saw that list.
Generally, the more features you add to an item, the more diverse those features, and the cheaper they sell it, the lower the quality and durability will be.
Swiss Army Knives (SAKs)s are a fair example. Comparing a single-blade folder to a SAK of equal cost usually shows the folder to be superior as a knife. The SAK usually gets a break because all the 'blades' are made of similar materials and go through similar manufacturing processes. Everything is made by the same company, often in the same plant. So the mechanism benefits from this in fit, finish and general quality.
Lately I have seen SAKs showing up with LED flashlights, the occasional compass and sometimes even a thumb drive. As much as these seem like useful items as diversity of materials and features widens so does the chances that mistakes will get made and missed in the QA process. Demand that the product sell cheap and your just begging for unreliability and low quality.