"rubber worm" = yes
Nowdays just called "soft plastics" because there is more than just worms availible, as you can see in the picture.
crank baits = no. These are hard plastic and have hooks attached.
Nothing wrong with buying this just to "have some". With many thousands of different types and brands of soft baits manufactured and sold, these are likely the ones that are slow sellers, and BPS bundles them and sells them as a varity pack.
If you sit on the bank, and "throw the bait out and wait", these arent for you, nightcrawlers are better, as far as worms go. If you want to fish, (or learn how to fish), with soft baits, go for it, once you lose your share of less expensive soft baits, you can buy just single packages of the type and color that seem to work good for you, after you try different ones from this variety pack. Berkley Power Worms and their other SB's with fish attractant work much better, but at $3.99 for a package of 10 or so, you get more for your $10 here.
Another real value here is the reported free shipping on other items added to the cart. Look around, see if there's a book on "fishing soft plastics". Lots to learn, to be "catching" fish with these SB's, instead of just "fishing" with them.
EDIT: Wont deteriate at room temps. Heat and or time will allow any scent added to the soft plastic to lessen over time. These in a garage for a year will be fine. They will, when new or not, melt hard plastic boxes that are not "worm proof", if they come in contact more than a hour or so. This also includes any plastic bobbers, etc, that these worms touch when in your tackle box. Makes a sticky mess. Put the SB's in a zip-lock bag, then in the tackle box, if you arent sure.