I bought this about 10 months ago and have refrained from reviewing until I gave it a few good tries. The very first time I used this (for a martini) it leaked all over my hand... Disappointment. Then, I couldn't get the cap off. It was basically frozen on, because the cold ice caused it to shrink. I finally just had to screw off the top and dump my drink through a slotted spoon. Classy. After many attempts over the months, I've found that if I shake this back and forth instead of up and down (I hope that makes sense, basically I just don't let the liquid and ice get near the cap) then you can still remove the cap. If you are like me and prefer a really cold martini with ice shards, sorry, you can either have the ice or you can get the cap off.... not both. Also, if you don't completely disassemble this immediately after use, it rusts. I'm talking like the next morning there is rust on it. Just go buy a regular martini shaker from a nice liquor store.