Best to put those flying things in the truck. Even if someone bumps into you they could and will go flying. Smart thinking on your part.

I put the cutter in the klutz glove and put in a pillowcase vinyl zipper bag along with a packet of extra blades. The entire thing goes in the side pocket of my sewing machine case along with the plastic bin with sewing implements.

I've never found one that everything fit into well that wasn't just too bulky. It seems to suit me better to have several separate small containers, so I can bring just what I want with me and stuff them into various pockets in my suitcase or in my machine's case.

I think I've read of other people using and liking tackle boxes, though, so it's probably just a personal preference kind of thing. If you already have one, give it a try!

Never thought about how I carry my rotary cutter. It's tossed in my my notion box that latches and that is put in a tote that is filled with all it will hold. If it requires more then that then it can stay home.

If you have a cutter with exposed blade then get rid of it and buy a newer one.

I love my Olfa Ergonomic rotary cutters. They have a locking button on them. I just put them in my little "sewing case" (cosmetic bag) & off I go. If you're really worried about it, you could put it in a small Tupperware container & keep it on the floor in the backseat, but that's probably overkill. If something happens that causes your rotary blade to automatically extend & fly up and into your body, the cut is probably the least of your injuries. I used to work for an insurance company and heard all kinds of gory tales. Never once did I hear about one of our insureds getting injured by a flying rotary cutter. Close the blade & place it in something (purse, bag, etc) and you should really be fine. I think you have a higher chance of having a swarm of bees fly into your car and kill you than your rotary blade extending and wounding you.

Back to School sales had clear and semi transparent colored plastic pencil cases that were the exact size for storing rotary cutters. 59 cents so I bought a few.

I use pencil cases for some of mine (my 18mm) and for my 45mm. I also have a case from Omnigrid that is for a rotary cutter, that I use to carry a pair of scissors and my rotary cutter. You could also use some kind of tin.

You might try a Crystal Light container. This is what I use to put my rotary cutter in after you enjoy all of the Crystal Light drink of course. :)

I have a large zippered tote that is big enough for 18 x 24 cutting board and rulers with side velcro pockets for scissors, cutters, etc. and I also carry a pencil box for small notions: needles, seam rippers etc.