INDOOR & OUTDOOR USE: Designed and tested by experienced climbers. Perfect rock climbing chalk bag for outdoor adventures or training inside at your local gym. These are also available on Amazon for $18.95 w free shipping!! Search “climbing chalk bag.” PREMIUM MATERIALS AND CRAFTSMANSHIP: Main body constructed from tough, water-resistant materials to withstand abuse and ensure maximum durability. Soft fleece inner lining is gentle on your hands. CHALK UP WITH EASE: Our climbers chalk bag has a large chalk bucket and sturdy rim for easy access.