Hellobee Boards

I think what my kids have is the National Geographic (colored version). Note that the color can somewhat transfer to hands (per some reviews - ours is pink so I haven't really noticed this so much) and to clothes/other surfaces (I do notice this if my kids, say, sit in it).

It can be an indoor toy, but definitely is messy. If you play on a clean, smooth surface like a glass table top or smooth table cloth, it's easier to pick up the stray bits and not collect dirt/food crumbs in your sand. I recommend one container to keep sand in, and another container as a "play surface" for each kid to minimize mess (or just use the lid of your storage container). Plastic take-out containers work great!

One two-pound bag was enough for 1-2 kids; if you don't mind storing extra it might be nice for each kid that wants to play to have their own (and you might want to play, too - it feels nice!)

I feel like it’s made to be played with inside, although that doesn’t mean you can’t make a mess with it if you try hard enough.

We have the same set as @Rocker2014 and it works great. We got an extra bag of the beach sand to fill it out more. It does make a mess sometimes, mostly because it sticks to my kids clothes and then falls off elsewhere in the house. But it’s not too annoying to clean.

my 4 year old LOVES kinetic sand. I usually put it in a tray or something, or he has to stay at the counter. some of it ends up on the floor and just getting trashed, but if you keep it contained its not too messy... I give rolling pins, cookie cutters and lots of little containers and things to move it around & play with.

I got my 4 year old the same folding sandbox set mentioned above, and she loves it. It’s definitely messier than I expected (somehow she always manages to get it stuck to her clothing and then drag it around the house before I notice ), but not too bad to clean up.

I like the beach sand that came with it, but I accidentally ordered her a small green refill package for Easter and of course, she loves the coloured sand more. The colour did transfer to her hands, though, as others mentioned above.

My 4 ,y/o has the kinetic sand brand. We got him the set that has the box to store and play in, and it maintains the mess pretty well. It is probably the best money we've spent toy wise for him. He got it for Christmas and still plays with it multiple times a week.

The playset came with a bunch of molds that seems to be enough to entertain him.