This thread seems vaguely familiar lol.. it must be the season for sorting jiffy bags, just been doing that very thing. Anyone else find you never have the right jiffy bag for the thing you want to pack.. even though you could've sworn you have every size/shape known to man? Especially when you're trying to remember which of its 6 dimensions will take it from a lettery packet to a thinner but larger packety parcel, & up a whacking price bracket.
any box you really really want to fit inside another is always ¼" too wide one way in my experience..