Let me start by saying these Bobino Zipper Clips have become my go-to travel essential. I've used them on multiple trips across Europe and Asia, and they've given me that extra layer of security I needed in crowded places.

The design is brilliantly simple - just clip them onto your zippers and twist to lock. What I love most is how they deter pickpockets without being obvious like traditional locks. During my trip to Barcelona (pickpocket capital!), I could feel immediately if someone was tampering with my backpack.

Now for the real talk - yes, they can be tricky to open at first. But after a few tries, it becomes second nature. The two-step mechanism (push tabs inward) is what makes them effective - too complicated for thieves but manageable for owners.

I've found them perfect for:
- Backpack pockets in crowded metros
- Crossbody purses in tourist areas
- Duffel bags in bus terminals

A few things to note:
1. They work best with two zipper pulls
2. Not as secure as combination locks (but much more convenient)
3. Plastic may wear over time with heavy use

For the price, these offer excellent peace of mind. They won't stop a determined thief with time, but they'll definitely prevent opportunistic grabs - which is exactly what most travelers need.