SweeTarts. Bottle Caps. You may have to repackage both, though, or do a major stock up at Halloween time?? (The “mini chewy” SweeTarts don’t fit your requirements, but may be the most addictive candy I’ve ever tried (I also may be a weirdo!))
I could also mention Smarties (U.S. version, which are like loped off pieces of chalk), but I think they’re gross.
One more idea, which is my current LBS candy for on-the-go: STARBURST FaveREDS Minis. Flat and they fit together in a package nicely. And they’re super tasty and ALL versions on a red theme! (Not sure why this won’t embed, but they’re available on amazon). Let us know what you wind up getting! I can’t wait to see everyone else’s ideas, too! (I don’t think I’ve had a glucose tab in my 31.5 years of being diabetic!)
Check out CVS or Walgreens etc clearance after Valentine’s Day for little packages of candy that goes along with v-day cards for classroom exchanges. You might find what you’re looking for there. Or on the same trip, they’ll have just stocked for Easter, so do a run through that aisle and peek at all of the little packets of what can be stuffed into a plastic Easter egg (or stored flat for low blood sugar purposes!). I know I have seen little SweeTart packages for both v-day and Easter.
I realize I sound like a complete nut here, but this is my sweet (haha) spot! And I thought of the perfect idea for you! Laffy Taffy! It is as flat as it can be and doesn’t really go stale. As you know, I DO NOT LIKE banana, so I custom blend my mix. 7g carb each. (so irritating that it won’t post the pic; I think the link will still work – I think it’s not posting the link b/c it’s special to me on amazon b/c I’ve purchased before)
Not only are they flat, they bend and conform to curves. Very space efficient, good dosage per bar, not too hard to open, and yummy. The only potential problem is if you keep them somewhere cold they get hard and tough to chew.
Yes, Airheads! Flat as can be. They were my go-to in color guard in high school. Even without pockets, they’d stay put in a costume’s waistband in case of a middle-of-the-show emergency… and when it was snowing, the body temperature kept them just right. Getting a blue tongue is a plus too!