Eek - I better publish this one fast or it'll be Wednesday!
See these random office supply clips?
Best. Kitchen. Clips. Ever.
Easy on and off but best of all they keep foods airtight in the pantry, fridge or freezer!
Here's a tip on the tip though - when you undo the clip do you often lose like I used to? Make sure to clip it to your box or open bag as soon as you undo it saving yourself from counter surfing for the missing clip!