Real talk: seams don’t “pinhole” randomly-it’s delamination from hydrolysis in PU coatings under scaling stress. Larger bags = deeper effective submersion in packs, pressure scales quadratically (Darcy’s law, baby). Hyperlite’s RF-welded Cuben Fiber laughs at it-tensile strength >500N/cm per their OR lab data, zero cycles to failure at 1.5m head.
Ditched tape entirely after reading that arXiv preprint on laminate fatigue (2310.04567, hydrophobic scaling laws apply). Roll it, sure, but test dunk your 20L first-most fail IPX8 equiv after 50 cycles. Mine’s 500mi CD-T, zero ingress. Product chasers skip the physics, eat wet quilts.