Add one of these to a shoulder strap and it will make you load more bearable, and help keep the shoulder strap from slipping off your shoulder
Shoulder Pads for Shoulder Straps
ivoler AMUSA0140013-A Travel Case for Nintendo Switch Game - Black
Pro Tec Deluxe Neoprene Non-Slip Shoulder Strap Pad
DETACHABLE SHOULDER PAD (Khaki brown, 1pcs, M size) - Handmade
Shoulder Pad – TAB Gear
1Pcs Detachable Shoulder Strap Pad Cushion For Backpack Shoulder
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Memory Foam Shoulder Strap Pad Padded Cushion Shoulder Strap Grip
ADVANCED SHOULDER PAD (ASP) - Armor Express
Low-Profile Shoulder Pads
Caribou Leather Shoulder Pads – Yukon Bags
Gel Strap Shoulder Pad - Banjo Ben's General Store
Deluxe Strap Pad™ Shoulder Strap Pad With Molle by Hazard 4