The ornamental design for a storagetube and cap, as shown and described.
FIG. 1 is an isometric top view of a first embodiment of the top portion of a storage tube and cap showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is an exploded isometric view thereof;
FIG. 6 is an isometric view of a second embodiment of the top portion of a storage tube and cap;
FIG. 7 is a front elevation view thereof;
FIG. 8 is a side elevation view thereof;
FIG. 9 is a top plan view thereof; and,
FIG. 10 is an exploded isometric view thereof.
The broken line showing of a container and lid is included for the purpose of illustrating portions of the storage tube and cap and forms no part of the claimed design.