Moisture retention seal

A package comprising:

• a closure having a non-planar interior surface having upper and lower portions and forming an aperture, the closure further comprising a lid configured to alternatively couple with the aperture in either one of a closed relationship and an open relationship, the lid being movable relative to the upper and lower portions of the closure;
• and
• a canister having a bottom and a flexible top portion forming an opening covered by the closure,
• the upper portion of the closure being spaced a first distance from the bottom of the canister, the lower portion begin spaced a second distance from the bottom of the canister, the first distance being greater than the second distance,
• the lower portion of the interior surface forming a protrusion having a leading edge, the protrusion leading edge abutting the flexible top portion of the canister to normally apply a generally downward contact force to at least part of the flexible top portion to form a top seal between the closure and the canister, the leading edge of the lower portion deflecting the part of the flexible top portion generally downwardly from a rest position,
• wherein the flexible top portion of the canister is in the rest position when not connected with the closure, the lower portion of the interior surface deflecting the flexible top portion by a deflection angle from the rest position, the deflection angle being less than about ninety degrees when connected,
• the lower portion abutting but not locking against the flexible top portion of the canister.