If you use a switch rod = I use a Skagit head suited to the grain window, and various poly-leader tips

Design features Nylon ripstop outer fabric Durable Cordura base fabric Adjustable AirFlo Flexi-Fit harness for moderate loads Lightweight internal stays for stability on the trail 3D Air Mesh and a generous back channel for ventilation Multiple foams provide hours of comfort Single compartment with internal base divider Dual ice axe/walking pole attachments Integrated rain cover Side compression straps Hydration bladder compatible Side pockets Top grab handle Product Specifications Care You are best to clean your pack with a natural, non-detergent soap and a soft-bristled brush Suitable soap types are: pure soap, vegetable soap and Nikwax Tech Wash Rinse the pack well and dry it in a well-ventilated area out of direct sunlight Do not put your pack in the washing machine as this will void your warranty Always try to keep the zip teeth clean wash with fresh, clean water and lubricate with a silicon lubricant suitable for use on fabrics Do not tumble dry, iron or dryclean 60 DAY RETURNS If you're not completely satisfied, you are welcome to exchange your purchase* with the original receipt for a full refund, store credit, or an alternative product, within 60 days

I am curious if it may not even be the actual drag system itself
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Choosing a Liner A high-quality EPDM rubber pond liner is ideal for long-lasting durability