I use these to store gemstone beads for jewelry projects; they will hold a standard 16" strand of most beads, up to 12mm size (or around 1,000 2.5mm beads). They stack well, and it's easy to view the contents in the cupboard, easy to see on my workbench.The top snaps on tight - vital in case of spills. I have dropped several full but covered cups on several occasions - none opened!No ketchup, mayo, nor mustard in these cups! Although they should be great for that too... I bet they would be excellent for blue cheese dressing... Mmmm!I use at least one of these little containers every day. They are a great size for condiments to complement your meal. Grated cheese, salsa, salad dressing are a few ways I use them. The lid snaps on well and keeps them pretty airtight.these work greatTons of tiny cups and lids! They're just what I needed to make jell-o shots for a party. They're durable, but the lids are a little thin and tricky to get onto the cups. The little jokers try to pop off right before they snap on if you're not careful, lol. I'll definitely order them again, though.Yeah, they make great jello shots, but they are also perfect for so many other things. Salad dressing to go in the lunch box and even to start seedlings!Love these. Great if you have a business as wellLet's be real.. you know what you are buying them for.. and they work great for Jello! We used every one of them for a party we had and had no complaints. Just a fun little tip - once you fill with Jello, put them in the fridge upside down! That way when you eat them for your eh.. party.. it is much easier!