The T134 is for most small or average-size heads like Arca-Swiss B1, Kirk BH-1 or Really Right Stuff BH 55 (snug but does fit). T317 is for larger heads like B1g and Foba ball heads.
There are too many heads to list every make and model -- so please, before e-mailing us with "which model is right for me" simple measure your head and compare against specs to the right.
Each model is a circular design with an open end which closes with a corded opening. Designed to slip over a ball head while attached to a tripod or for storage. The T134 or T314 will not attach to a belt or pack however. They are lined with a light 4mm open cell foam for protection. The inside features a light gray soft polyester tricot-like fabric. The exterior has a standard black 500-denier Cordura Plus fabric with a weatherproof ureathane coating.