L：length 90cm, suitable for all brands of 400mm f/2.8, 500mm f/4, 600mm f/4, 800mm f/5.6 lens use.
M： length 70cm, suitable for each brand of 200-400mm f/4, 300mm f/2.8 and Sigma 150-600mm Sports version, Sigma 120-300mm f/2.8, Nikon AF-S 200-500mm f/5.6E ED VR use.
S：length 60cm, suitable for all brands of 300mm f/2.8, 400mm f/4, 200mm f/2 lens use.
XS： length 60cm, fit
Canon Canon EF 100-400mm f/4.5-5.6 L IS II USM;
Canon Canon EF 100-400mm f/4.5-5.6 L IS USM;
Canon Canon EF 400mm f/5.6 L USM;
Canon Canon EF 70-300mm f/4-5.6 L IS II USM;
Nikon Nikon AF-S 80-400mm f/4.5-5.6 G ED;
Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary;
Sigma APO 50-500mm f/4.5-6.3 DG OS HSM;
Sigma APO 150-500mm f/4.5-6.3 DG OS HSM;
Sigma APO 170-500mm f/4.5-6.3 DG OS HSM;
Tamron SP AF 150-600mm f/5-6.3 Di dragon VC USD;
