▁heavy ▁loads , ▁such ▁as ▁b ab ies ▁and / or ▁large ▁quantities ▁of ▁food st uff ▁( y ams / pot atoes / k au - k au ▁etc .). ▁Men ▁sometimes ▁prefer ▁to ▁use ▁long ▁handle ▁styles ▁so ▁they ▁can ▁be ▁worn ▁over ▁the ▁shoulder , ▁free ing ▁their ▁arms ▁for ▁tasks ▁such ▁as ▁carrying ▁bush ▁kn ives ▁or ▁to ▁holding ▁onto ▁things ▁while ▁h ik ing ▁mountains . ▁▁ ▁Either ▁way , ▁there ▁is ▁now ▁a ▁definite ▁swing ▁to ▁the ▁more ▁v ivid ▁color / pattern ing ▁styles ▁that ▁afford ▁the ▁bear er ▁to ▁be ▁more ▁distinct ive ▁in ▁making ▁their ▁fashion ▁statement . ▁ ▁The ▁concept ▁of ▁bil ums ▁are ▁very ▁market able ▁over se as , ▁and ▁a ▁French ▁company ▁has ▁registered ▁Bil um ▁as ▁a ▁tra dem ark , ▁which ▁it ▁uses ▁for ▁its ▁lines ▁of ▁b ags ▁made ▁from ▁rec yc led ▁building ▁front s ▁giant ▁advert ising ▁sheets , ▁car ▁seat bel ts ▁and ▁air b ags , ▁and ▁other ▁pl astic ▁materials . ▁ ▁They ▁come ▁in ▁different ▁patterns , ▁each ▁pattern ▁res emb ling ▁certain ▁tribe ▁or ▁cl an . ▁More ▁complex ▁and ▁specific ▁patterns ▁are ▁made ▁for ▁carrying ▁during ▁public ▁appearances ▁or ▁displayed ▁during ▁the ▁cer emon ial ▁events . ▁The ▁special ▁cer emon ial ▁events ▁include ▁y am ▁festiv als , ▁tamb uan ▁d ances , ▁b ride ▁price ▁payment , ▁dead ▁compens ation ▁and ▁bar ter ▁system ▁between ▁the ▁river ▁people ▁and ▁the ▁in land ▁w os era ▁people .