Sec. 1. Where 'bags' are provided for in separate descriptions of articles as outer shipping containers and no reference is made to construction, material, closing or sealing, they may be used for dry commodities only, see Note 1, and they must be made of cloth sufficiently strong and so closely woven and stitched as to carry contents safely and prevent sifting;

OR
       Shall be double bags consisting of an outer wall of cloth and an inner wall of cloth or paper with both walls securely closed so as to carry contents safely and prevent sifting;

OR
       Shall be constructed of a woven polypropylene cloth, tightly woven, or laminated to another material, so as to prevent sifting. The polypropylene cloth must weigh not less than 2.4 ounces per square yard and must have a minimum count of 12 x 8, warp and fill;

OR
       Shall be multiple-wall paper bags conforming to the provisions for Sec. 2, and must be so closed as to carry contents safely and prevent sifting;

OR
       Shall be of at least two walls of free dried shipping sack Kraft paper meeting the paper strength requirements of three walls of 40 pound extensible Kraft (120 pound Total Basis Weight) in Tables C and D for up to 89 pounds (40 kilograms) of product or 2 walls of 40 pound and 1 wall of 50 pound extensible Kraft (130 pound Total Basis Weight) for up to 111 pounds (50 kilograms) of product. Bags must be so closed as to carry contents safely and prevent sifting.
Multiple-Wall Paper Bags
    Sec. 2. Multiple-wall paper bags, namely bags having three or more walls, must be made of Shipping Bag Kraft paper meeting the minimum basis weights, tests and requirements contained in Tables A or B as modified by Note 1; or of Extensible Shipping Bag Kraft paper meeting the minimum basis weights, tests and requirements contained in Tables C or D as modified by Note 1. For contents of 89 pounds (40 kilograms) or less, bags must have a total basis weight of not less than 120 pounds for all walls. For contents of more than 89 pounds (40 kilograms) but not more than 111 pounds (50 kilograms), bags must have a total basis weight of not less than 130 pounds, including an outer wall of basis weight not less than 50 pounds. Where paper bags with a designated number of walls are authorized, multiple-wall paper bags with any greater number of walls may also be used.

TABLE A
Shipping Bag Kraft Paper, Plain
Other than Wet-Strength
	Minimum Average Dry Tearing Strength		Minimum Average Dry Tensile Strength Per Inch Width
Basis Weight 24 x 36-500	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams	Pounds	Pounds
40	88	188	14	41
50	110	235	19	53
60	132	282	23	64
70	154	329	27	74

TABLE B
Shipping Bag Kraft Paper, Plain
Wet-Strength
	Minimum Average Dry Tearing Strength		Minimum Average Dry Tensile Strength Per Inch Width		Minimum Average Wet Tensile Strength Per Inch Width
Basis Weight 24 x 36-500	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams	Pounds	Pounds	Pounds	Pounds
40	75	160	16	45	3.8	11.1
50	94	200	21	58	5.1	14.6
60	113	240	25	70	6.2	17.8
70	132	280	29	80	7.3	20.5

    For multiple-wall paper bags made of papers described in Tables A and B, allowable and compensated variations in strength requirements are as follows:
       Tensile Strength: Lower C.D. tensile strength of not more than two units multiplied by the number of walls in the bag will be permitted, provided the lower tensile strength is compensated by an increase in the M.D. tearing strength of five units of tearing strength to one unit of lower tensile strength, and lower total tensile strength (M.D. plus C.D.) of not more than four units multiplied by the number of walls in the bag will be permitted, provided the lower total tensile strength is compensated by an increase in total tearing strength (M.D. plus C.D.) of five units of tearing strength to one unit of lower total tensile strength.
       Tearing Strength: Lower M.D. tearing strength of not more than ten units multiplied by the number of walls in the bag will be permitted, provided the lower tearing strength is compensated by an increase in the C.D. tensile strength of one unit tensile strength to each five units of lower tearing strength; and the lower total tearing strength (M.D. plus C.D.) of not more than twenty units multiplied by the number of walls in the bag will be permitted, provided the lower total tearing strength is compensated by an increase in total tensile strength (M.D. plus C.D.) of one unit of tensile strength to each five units of lower tearing strength.
       Variations in wet tensile strength are not permissible.

TABLE C
Shipping Bag Kraft Paper, Extensible
Other than Wet-Strength
	Minimum Average Dry Tearing Strength		Minimum Average Tensile Energy Absorption Foot-Pounds per Per Square Foot of Paper
Basis Weight 24 x 36-500	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams
40	88	188	4.5	14.0
50	110	235	5.6	17.0
60	132	282	7.0	20.0
70	154	329	8.0	23.0
80	176	376	9.0	26.0
90	198	423	10.0	29.0
100	220	470	10.8	32.0
110	242	517	11.6	35.0
120	264	564	12.4	38.0

TABLE D
Shipping Bag Kraft Paper, Extensible
Wet-Strength
	Minimum Average Dry Tearing Strength		Minimum Average Dry Tensile Energy Absorption Foot-Pounds Per Square Foot of Paper		Minimum Average Wet Tensile Energy Absorption Foot-Pounds Per Square Foot of Paper
Basis Weight 24 x 36-500	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams
50	88	180	5.6	17.0	1.8	3.6
60	107	220	7.0	20.0	2.1	4.7
70	125	260	8.0	23.0	2.4	5.4

    For multiple-wall paper bags made of papers described in Tables C and D, allowable and compensated variations in strength requirements are as follows:
       Tensile Energy Absorption: Lower C.D. tensile energy absorption of not more than 0.5 units multiplied by the number of walls in the bag will be permitted, provided the lower tensile energy absorption is compensated by an increase in the M.D. tearing strength of twenty units of tearing strength to one unit of lower tensile energy absorption; and lower total tensile energy absorption (C.D. plus M.D.) of not more than one unit multiplied by the number of walls in the bag will be permitted, provided the lower total tensile energy absorption is compensated by an increase in total tearing strength (M.D. plus C.D.) of twenty units of tearing strength to one unit of lower total tensile energy absorption.
       Tearing Strength: Lower M.D. tearing strength of not more than ten units multiplied by the number of walls in the bag will be permitted, provided the lower tearing strength is compensated by an increase in the C.D. tensile energy absorption of one unit of tensile energy absorption to each twenty units of lower tearing strength, and the lower total tearing strength (M.D. plus C.D.) of not more than twenty units multiplied by the number of walls in the bag will be permitted, provided the lower total tearing strength is compensated by an increase in total tensile energy absorption (C.D. plus M.D.) of one unit of total tensile energy absorption to each twenty units of lower total tearing strength.
       Variations in wet tensile energy absorption are not permissible.
    Sec. 3. Where 'paper bags' are provided for in separate description of articles as outer shipping containers, they must conform to the minimum basis weight requirements of Table E and shall be made of any number of plies of Kraft paper meeting either the test requirements contained in Tables F or G, as modified by Note 1, or of Kraft paper meeting the requirements of multiple-wall paper bags, Sec. 2., as modified by Note 1, and must be so closed as to carry contents safely and prevent sifting.

TABLE E
Paper Bags; Minimum Bag Basis Weight
			Kraft paper bags. Kraft paper must consist of all sulphate pulp and no other fibre, or sulphate pulp and Manila rope fibre and no other fibre, the rope fibre constituting a smaller proportion than required for rope stock paper.
Standard bags	Contents of bag not to exceed pounds (kilograms)	Rope stock paper bags. Paper must contain not less than 75 percent weight content Manila rope fibre	Plain Kraft bags see Table F	Extensible Kraft bags see Table G
		Basis weight of paper per 500 sheets 24 x 36 inches. See Note 1.
No. 1	12 1/2 (5)	70	80	70
No. 2	25 (10)	80	90	80
No. 3	56 (25)	90	100	90
No. 4	67 (30)	95	100	90
No. 5	89 (40)	95	120	100
No. 6	111 (50)	100	130	110

TABLE F
Plain Kraft Paper
	Minimum Average Dry Tearing Strength		Minimum Average Dry Tensile Strength Per Inch Width
Total bagwall basis weight	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams	Pounds	Pounds
80	148	326	22.8	69.0
90	168	368	24.8	79.0
100	188	410	26.8	89.0
110	208	452	28.8	99.0
120	228	494	30.8	107.0
130	248	536	32.8	113.0

TABLE G
Extensible Kraft Paper
	Minimum Average Dry Tearing Strength		Minimum Average Dry Tensile Energy Absorption Foot-Pounds Per Square Foot of Paper
Total bagwall basis weight	M.D.	Total M.D. plus C.D.	C.D.	Total C.D. plus M.D.
Pounds	Grams	Grams
70	134	299	6.9	21.0
80	156	346	7.7	24.0
90	178	393	8.5	27.0
100	200	440	9.3	30.0
110	222	487	10.1	33.0
120	244	534	10.8	36.0

    Note 1- The following statements, exceptions and definitions are applicable to the requirements of both Sections 2 and 3.
       CONFORMANCE: Conformance with the applicable requirements of Tables A, B, C, D, F or G, shall be established by comparing the sum of the basis weights and tests for the walls required in the construction of the bag, with the respective sums of the basis weights and tests for the papers comprising the walls of the bag.
       Requirements in the tables are for papers conditioned in an atmosphere having a humidity of 50% plus or minus 2% at a temperature of 23°C plus or minus 1°C (73.4°F plus or minus 1.8°F) following preconditioning in an atmosphere having a relative humidity of 10 to 35% at a temperature of 22° to 40°C (72° to 104°F).
       Tests to determine compliance with tearing strength requirements must be made on testing machines not modified so as to reduce friction between test specimens and component parts of the testing machine.
       Tests to determine compliance wth tensile strength requirements must be made on pendulum type tensile testing machines.
       EXCEPTIONS: Bags constructed wholly or in part of papers of other types or basis weights than those listed in Tables A, B, C, D, F or G, must conform to the requirements of Secs. 2 or 3.
       ASPHALT LAMINATED: Asphalt laminated Kraft paper shall consist of two sheets of Kraft paper, with the total basis weight of the two sheets not less than 50 pounds per ream (24 x 36 - 500), continuously and uniformly laminated together with an average of not less than 25 pounds of asphalt per ream. Tolerance of minus 5 percent will be allowed on individual components. In determining the test conformance of bags containing an Asphalt Laminated Plain or Extensible Kraft wall, the Asphalt Laminated Plain or Extensible Kraft wall shall be treated as if it were a single Plain or Extensible Kraft wall or combination of walls of 10 pounds lower basis weight than the sum of the nominal paper basis weight in the Asphalt Laminated wall but in no case shall it be treated less than the equivalent of a 50 pound basis weight wall. For purposes of computing minimum number of walls required, the Asphalt Laminated wall shall be considered as one wall.
       WET-STRENGTH: Whenever wet-strength is used, it must be distinctly marked for identification with longitudinal stripes spaced on not less than two-inch nor more than ten-inch centers across the paper width. No other grade of paper used in the bags shall be striped in this manner. When wet-strength paper is used as the outer wall, the identification must appear on the external surface of the bag.
       BASIS WEIGHT: The basis weight of paper is the weight in pounds as produced by the paper machine, of an area equivalent to a ream of 500 sheets 24 x 36 inches and does not include the weight of coatings, printing, laminants or impregnants.
       A tolerance of minus 5 percent will be permitted in the sum of the basis weights of all walls specified in the sack. Variations in excess of the specified basis weights are allowed.
       M.D. and C.D.: The initials M.D. and C.D., as used in the above Tables, mean Machine-Direction and Cross-Direction, respectively.
       DRY COMMODITIES: For purposes of this rule, dry commodities are those which are not liquid or which do not contain any free liquid.
    Sec. 4. Where in individual items reference is made to this section, bags need not comply with the requirements of Secs. 2 or 3. Such bags must not bear bag maker's certificate unless they do comply with Secs. 2 or 3.
    Sec. 5. Not currently used.
    Sec. 6. Bags conforming with the foregoing specifications or to specific package numbers must bear certificate of bag maker stating that they do conform. The certificate may bear an identifying symbol or trademark of the bag maker in lieu of the bag maker's name and such symbol or trademark must be registered with the National Classification Committee. Only one identifying symbol or trademark may be registered for each bag maker. The certificate must be of the following form, size (1 1/4 inches x 3 inches), type and wording, except that the size may be varied not to exceed 1/4 inch in either or both directions: