I try and keep a small stock of 2 part 5 minute glue for the odd repair.
Before lock-down my local pound shop would have a suitable product at, surprisingly, a pound :)
During lock-down I ran out of stock so ordered some no-name 2 part glue from Ebay. It came all bubble wrapped on a card and I put it away this way for future use.
Wind on many months and today I need to use it. I cut open the bubble pack and observed that the reasonably large tubes were rather flat but folded in such a way to look full in the bubble pack. Sure enough there is a minimal amount of material in each tube and probably only a tenth of the glue that I got from my pound shop purchases!