A reagent container pack comprising: a base for holding a plurality of reagent containers (208 a, b, c, d), said base comprising a bottom, a back wall, and a vertical slot extending from the bottom of said base along a portion of the back wall; a cover comprising a horizontal slot a plurality of hollow tubes joined to said cover, said tubes comprising a first end and a second end, each of said first and second ends comprising an opening; a lid comprising a plurality of holes, a free end, and a fixed end, wherein said lid is slideably moveable in said horizontal slot from a first position wherein said first hollow tube end is covered by said lid and a second position where said first hollow tube end is uncovered by said lid; an elongated tab joined at one end to the fixed end of said lid and the other end of said elongated tab slideably moveable in the vertical slot of the base, said elongated tab 218) comprising an inner face and a horizontal tab extending horizontally from said inner face toward said base back wall; and wherein said elongated tab is capable of transitioning from a first relaxed position to a second biased position, whereby in said biased position of said elongated tab, said lid transitions from said first position to said second position characterised in that the cover comprises at least one snap lock mechanism positioned on a side of said cover wherein said cover is capable of transitioning between an elevated position above the top sides of a plurality of reagent containers (208 a, b, c, d) each having a top side comprising an opening, and a lowered position in which said cover transitions closer to the top side of said plurality of reagent containers (208 a, b, c, d) than when in the elevated position, wherein compressing said snap lock mechanism permits the cover to transition between the elevated position and the lowered position; and said other end of said elongated tab is capable of moving from an upper position to a lower position in said vertical slot when said cover is transitioned from an elevated position to a lowered position, optionally wherein the plurality of reagent containers (208 a, b, c, d) are removable reagent containers, wherein each reagent container in the plurality of reagent containers (208 a, b, c, d) comprises a seal sealing the opening of the reagent container. a base for holding a plurality of reagent containers (208 a, b, c, d), said base comprising a bottom, a back wall, and a vertical slot extending from the bottom of said base along a portion of the back wall; a cover comprising a horizontal slot a plurality of hollow tubes joined to said cover, said tubes comprising a first end and a second end, each of said first and second ends comprising an opening; a lid comprising a plurality of holes, a free end, and a fixed end, wherein said lid is slideably moveable in said horizontal slot from a first position wherein said first hollow tube end is covered by said lid and a second position where said first hollow tube end is uncovered by said lid; an elongated tab joined at one end to the fixed end of said lid and the other end of said elongated tab slideably moveable in the vertical slot of the base, said elongated tab 218) comprising an inner face and a horizontal tab extending horizontally from said inner face toward said base back wall; and