A bear canister's rigid, cylindrical shape makes it one of the more awkward items to fit into a soft-sided pack, but the placement principle is the same one that governs any dense, heavy item.
Where inside the pack does a bear canister fit best?
Most hikers pack a bear canister either horizontally, lying on its side near the bottom of the main compartment above the sleeping bag, or vertically, standing upright against the back panel in the core zone. Which orientation fits better depends on the specific pack's internal shape and diameter — some narrower packs only accommodate a canister lying on its side, while wider packs can fit one standing upright.
Wherever it sits, keeping the canister centered and close to the back panel, rather than pushed toward the front or bottom-outside edge of the pack, keeps its weight working with your balance instead of against it.
Should a bear canister be strapped outside the pack instead?
Packing a bear canister inside the main compartment is generally preferable to strapping it externally. An externally mounted canister sits further from your body, throwing off balance more than an internally packed one, and adds an awkward, protruding shape that can catch on branches or rocks on narrow trail sections.
If a canister genuinely won't fit inside a smaller-volume pack, external carry using top or side compression straps is a fallback, but it's a last resort rather than a first choice. Sizing a pack with enough core-zone volume to fit a canister internally avoids the trade-off entirely.