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REI [rei.com] has REI Co-op Stuff Travel Waist Pack & Sling (Green) on sale for $11.83. Shipping is free w/ REI Co-op membership [rei.com] ($30 lifetime), free on orders $60+, or free in-store pickup; otherwise $7.99 shipping under $60.

Features:[LIST][*]Versatile design lets you wear this as a waist pack or as a sling over your shoulder for crossbody function[*]Adjustable waistbelt offers an inclusive fit: one size fits from XS up to 4XL/4X