Tycho is available in Green or Red, Zeta in Orange or Red. The Zeta is capable of taking a "D" sized oxygen cylinder. Both rucksacks feature a full length zip, enabling them to be opened fully, for ease of access and showing contents at a glance.

• Length(open) 470 (1130)mm
• Width(open) 550 (550)mm
• Depth(open) 220 (90mm)
• Capacity 54 litres