Assertion: compression sack | /r/CapableOf | use external straps
Facets:
value: to compress a bulky sleeping bag
type: PURPOSE
Source sentences:
text: While most compression sacks use external straps to mechanically compress a bulky sleeping bag such as the Sea-to-Summit Ultra Sil Compression Sack, some also have a panel of breathable fabric which will vent air as you compress them by pressing on them.