Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4605027.
My girlfriend bought this set of cracker keepers from one of those mail order catalogs that they send out. The round container isn't so bad - the lid to that one screws on. The square one, though... good grief. As you can see, the original blue lid just sits there and it doesn't even do that so well. I whipped out FreeCAD and made a new lid for it. This one not only incorporates grooves to grab the ridge that is already an integral part of the original container, but also allows for a gasket to try and help seal the crackers in for freshness. The gasket I am using is cut from cork gasket material used for valve covers and other such automotive purposes. I glued the gasket to the lid with contact cement and it seems to be working well. Anything is better than what was there....
NOTE Due to either a Thingiverse bug or (more likely) shadowbanning, my models no longer show up under the [Newest] listings. If you want to see more of my models, please be sure to 'follow' me. If you print this, it would really help if you'd post a 'make' so that others could find this model.