Patent ID: 8533991

Claim:
A thermoformed sheet stock for a grow tube, comprising: a sheet of polymer having a first lateral band and a second lateral band defining a shortest distance therebetween, said sheet having a structure formed thereon and defining a baseline plane, said structure including: a plurality of longitudinal ribs that protrude in a first direction normal to said baseline plane, each of said plurality of longitudinal ribs defining an elongate axis that extends in a direction parallel to said shortest distance, said plurality of longitudinal ribs thereby defining a plurality of elongate axes, said plurality of elongate axes being substantially parallel to each other, each of said plurality of longitudinal ribs defining a rib length along a respective of said elongate axes, said rib length being less than said minimum length between said first lateral band and said second lateral band; and a first male snap form and a first female snap form, each centered along a first lateral axis that is orthogonal to said elongate axes, said first male snap form being configured to snappingly engage within said first female snap form, said first male snap form and said first female snap form each protruding in the same direction from said baseline plane, wherein a first of said plurality of longitudinal ribs is terminated proximate said first male snap form and a second of said plurality of ribs is terminated proximate said first female snap form, said first of said plurality of longitudinal ribs being configured to mate with said second of said plurality of longitudinal ribs.