参看以下各航空公司手提行李规定，20寸应该问题不大，别太沉。Airline No. of Bags Allowed Maximum Allowable Dimensions Max Weight 1、Alaska Air/Horizoncarry-on info 1/passenger 24" x 17" x 10" - You may also carry a purse, computer, briefcase, or small tote 2、American Airlinescarry-on info 1/passenger 45 linear inches (L+W+H) 40 lbs. You may also carry a purse, computer, briefcase, or small tote 3、America Westcarry-on info 1/passenger 51 linear inches (L+W+H) - You may also carry a purse, computer, briefcase, or small tote 4、Continentalcarry-on info 1/passenger 51 linear inches (L+W+H) 40 lbs. 5、Delta Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 6、Northwest Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 7、Southwest Airlinescarry-on info 1/passenger 24" x 16" x 10" - You may also carry a purse, computer, briefcase, or small tote 8、Spirit Airlinescarry-on info 1/passenger 22" x 13" x 10" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 9、United Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 10、US Airwayscarry-on info 1/passenger 24" x 16" x 10" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 11、Virgin Atlanticcarry-on info 1/passenger 22" x 14" x 9" 35 lbs

参看以下各航空公司手提行李规定，20寸应该问题不大，别太沉。Airline No. of Bags Allowed Maximum Allowable Dimensions Max Weight 1、Alaska Air/Horizoncarry-on info 1/passenger 24" x 17" x 10" - You may also carry a purse, computer, briefcase, or small tote 2、American Airlinescarry-on info 1/passenger 45 linear inches (L+W+H) 40 lbs. You may also carry a purse, computer, briefcase, or small tote 3、America Westcarry-on info 1/passenger 51 linear inches (L+W+H) - You may also carry a purse, computer, briefcase, or small tote 4、Continentalcarry-on info 1/passenger 51 linear inches (L+W+H) 40 lbs. 5、Delta Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 6、Northwest Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 7、Southwest Airlinescarry-on info 1/passenger 24" x 16" x 10" - You may also carry a purse, computer, briefcase, or small tote 8、Spirit Airlinescarry-on info 1/passenger 22" x 13" x 10" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 9、United Airlinescarry-on info 1/passenger 22" x 14" x 9" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 10、US Airwayscarry-on info 1/passenger 24" x 16" x 10" 40 lbs. You may also carry a purse, computer, briefcase, or small tote 11、Virgin Atlanticcarry-on info 1/passenger 22" x 14" x 9" 35 lbs

20寸箱子，少于10公斤，可以随身携带。