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Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.
Isobutane combines the clean, convenient heat of butane with low-temperature reliability. Our 4 oz gas cylinder is filled with a proprietary blend of isobutane and propane, for maximum heat and performance in low temps. This slimline canister fits many popular backcountry stoves and lanterns, and is small and light enough to disappear in the smallest pack.
We are a Seattle, WA based outdoor gear store with a mission to make climbing, backpacking, skiing & mountaineering accessible and enjoyable for everyone.
© 2026, Master Store
