Nice cup

Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month

- Good quality. Way better than plastic ones

- Easy to use

- Keychain is quite weak and looks very cheap, which affects the overall look of the item. I took out mine the minute I opened the package

- It is kind of heavy. That's OK because I keep mine at the office, but a traveller would appreciate a lighter item

- Not to be picky, but since the cap does not keep the moving parts tightly secured, it can be noisy when moving it while collapsed (though you should know)

It fits my needs perfectly

Good prodcut. I would buy this again. Keep in mind the size and weight before buying, as I could not recommend it for people who intends to use this on the go and wishes to travel light.