I have witnessed them refuse a fly for swimming awkwardly and punch a fly away from the nest with the kick of their tail

Included raincover made with PFC/PFAS-free DWR and bluesign APPROVED materials Curved zip access on each side panel Floating top lid with lash points Fabric reinforced front shove-it pocket Tall dual-access side water bottle pockets Dual upper/lower side compression straps Dual zippered hipbelt pockets Dual ice axe loops with upper compression strap capture Zippered sleeping bag compartment with removable divider Removable sleeping pad straps Internal hydration reservoir sleeve with center back exit port Stow-on-the Go trekking pole attachment system Two zippered front pockets provide additional organization options Fine-tuned fit: Fit-on-the-Fly harness and hipbelt make for improved comfort and a fine-tuned fit Integrated raincover: Keeps your pack and gear dry in inclement weather Enhanced organization: Large, curved side zip access into main compartment on both sides Main: bluesign APPROVED Recycled 210D honey comb Nylon, PFC/PFAS-free DWR Accent: bluesign APPROVED Recycled 210D high tenacity Nylon, PFC/PFAS-free DWR Bottom: bluesign APPROVED Recycled 500D high tenacity Nylon, PFC/PFAS-free DWR Load Range: 30-40lbs/14-18kg Volume: 3967in/65L Dimensions(HxWxD): 32.68x15.35x14.17in/83x39x36cm Weight: 4.613lbs/2.092kg Volume: 4150in/68L Dimensions(HxWxD): 34.65x15.35x14.17in/88x39x36cm Weight: 4.807lbs/2.18kg Features Included raincover made with PFC/PFAS-free DWR and bluesign APPROVED materials Curved zip access on each side panel Floating top lid with lash points Tall dual-access side water bottle pockets Dual upper/lower side compression straps Dual zippered hipbelt pockets Dual ice axe loops with upper compression strap capture Zippered sleeping bag compartment with removable divider Removable sleeping pad straps Internal hydration reservoir sleeve with center back exit port Stow-on-the Go trekking pole attachment system Two zippered front pockets provide additional organization options Fine-tuned fit: Fit-on-the-Fly harness and hipbelt make for improved comfort and a fine-tuned fit Integrated raincover: Keeps your pack and gear dry in inclement weather Enhanced organization: Large, curved side zip access into main compartment on both sides Materials Main: bluesign APPROVED Recycled 210D honey comb Nylon, PFC/PFAS-free DWR Accent: bluesign APPROVED Recycled 210D high tenacity Nylon, PFC/PFAS-free DWR Bottom: bluesign APPROVED Recycled 500D high tenacity Nylon, PFC/PFAS-free DWR Specifications Load Range: 30-40lbs/14-18kg S/M Volume: 3967in/65L Dimensions(HxWxD): 32.68x15.35x14.17in/83x39x36cm Weight: 4.613lbs/2.092kg L/XL Volume: 4150in/68L Dimensions(HxWxD): 34.65x15.35x14.17in/88x39x36cm Weight: 4.807lbs/2.18kg Volume 65 L

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It has improved castability, better line lay, less backlash, less wind knots or tangles, less friction on the line, larger, more comfortable grips, and higher max drag
But it complicates access to the main storage area and laptop sleeve