inflatable
adj.describing something that you can fill with air to make it larger and firm. You use this for things like balloons, lifeboats, or mattresses.
adj.designed to be filled with air or gas before use to achieve a specific shape or volume. Often used attributively to describe equipment that is portable when deflated.
“We brought an inflatable mattress for our camping trip.”
“The safety regulations require every small vessel to carry an inflatable life raft in case of emergencies.”
“The expedition relied on inflatable boats because they could be easily transported across the rugged terrain between the various river systems.”
Typically placed before the noun it modifies; often used in technical or recreational contexts.
From inflate + -able.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.