I get these things now every time I buy “deli sliced” meat or “fresh made” pasta.
I remove the labels and tape and gum.
*** The date stamps come off by “blotting” with Scotch tape. ***
Then into the dishwasher.
Then … ???
Are you asking for what you can use them for, beyond the obvious store/reheat leftovers?
They’re great for taking something other than a sandwich for lunch. Eat your leftover pasta, then toss into the bin.
I fill them with cookies and give them away at Christmas.
I keep one filled with water in my trunk for an emergency pet water dish.
Ditto with one filled with some sugary cereal for emergency kid snack.
Ditto with a handful of diaper wipes. (They’re are much more water-tight than the containers the wipes come in, and the wipes are great at getting the smell of gas or oil off your hands, as well as other small emergency cleanups.)
The roughly rectangular ones stack very nicely – anything that comes in a non-reclosable cardboard box or plastic bag can be transferred to one of more of them to prevent bug infestation.
If you use a laundromat or apartment laundry room, taking just the right amount of detergent premeasured into one can really save you money. Have you ever had a brand new $6 bottle of Wish vanish when a few friends just happened to have forgotten to bring soap, so could they borrow…
Anway, they’re free, they’re watertight, they’re practically weightless. I love them madly.
Just keep tabs on how many of the things you keep.
When the rest of the family cleared out the house after my (geographically) distant mother in law died, they found an entire ROOM filled with empty margarine, cottage cheese and cool-whip containers all stacked on the floor. They had to look in each and every container as she’d stashed things in random ones. A ring here, $10 there - they ultimately found two rings, a necklace and about $200, plus about ten pounds of long-expired grocery store coupons in those plastic containers.
So don’t keep too many of the things, or people will think you’re senile
We adore the lunchmeat that comes in those tubs, so there’s always a stack or two in the cupboard. Besides the usages mentioned above, I send a bunch in to the art teacher at the beginning of each semester. Mixing paints or ceramics or clay or just separating crafty doo-bobbies, they always ask for them and we’re happy to oblige.
They also come in handy when hosting, I get to load everyone up with leftovers and still keep my good tupperware safe.
I have so many but never found a use for them. I already had tupperware and Ziplock tubs before they started coming “free”.
But what I have to wonder is whether they are free at all.
Seems like they have a bag inside which is just like the bag on the other brand of lunchmeat. So why have a tub at all? Maybe when everybody has as many unused tubs as I do the trend will swing the other way and they’ll say: “Now without that pesky expensive tub!” 
We reuse them, until they either crack, get lost, or get shoved to the back of the fridge and forgotten until something is growing inside and its been there so long you can’t remember what it might be - then it goes into the trash!
Average life span of a container in my household - 3-4 uses.
Of course, we also have actual Tupperware (the real stuff - Tupperware brand & everything) which we take much better care of and which lasts for years.
I keep the occasional one. I throw the rest of them out with the recycling.
I Dump them all in the recycle bin immediately. They’re awkward, ugly & not durable. And it’s annoying when you have 10 tubs, 10 lids, and no two go together. Best to pitch them.
Now nothing screams trailer trash! like a Cool Whip ®™ container in the fridge full of yesterday’s chili or whatever. Unlabeled throwaway containers are almost tolerable, but no way I’d reuse labelled ones.
Yet on the other hand I reuse regular zip-lock type bags several times before trashing them.
Apparently consistency isn’t one of my virtues in this department.
Love 'em for leftovers. They work much better than cottage cheese or Cool Whip containers, because they’re more sturdy and the lids don’t pop off as easy (lunchbag tragedy!), and they’re clear, so you can tell what’s inside them at a glance (and whether it has something growing on it.) The best part is that when they get scuzzy (for biological or microwaved-tomato-sauce reasons) ya just chuck 'em, without feeling guilty.
For the same reason, soup containers from Asian restaurants kick ass. (Plus, they come with soup inside! Bonus!)
I’m with Queen Tonya on the handiness of these little containers for [del]foisting off[/del] gifting friends and loved ones with leftover goodies. I’ve got people coming over for dinner tonight and Sunday. I have these little containers all lined up waiting to be filled with my yummy home cooking and [del]foisted off on[/del] sent home with friends and loved ones so they can continue to be nourished with homemade goodness. I’m nice like that. Plus, I ain’t that big on leftovers.
There’s a soup kitchen in my town that always needs containers to send food home with people (they serve one meal a day; if they have food left over, they’re happy to let people take it with them for later). If you don’t have any use for them yourself and you have the inclination and the transportation, you might check around to see if there’s a similar need in your town.
Or recycle them.
Along the same lines: the local food pantry is always pathetically glad to receive supplies of grocery bags, either plastic or paper. The less they have to spend on packing materials to get the food to their patrons, the more they can spend on the food itself.